Changes in BitBake 1.8.x:
	- Fix -f (force) in conjunction with -b
	- Fix exit code for build failures in --continue mode
	- Fix git branch tags fetching
	- Change parseConfigurationFile so it works on real data, not a copy
	- Handle 'base' inherit and all other INHERITs from parseConfigurationFile 
	  instead of BBHandler
	- Fix getVarFlags bug in data_smart
	- Optmise cache handling by more quickly detecting an invalid cache, only 
	  saving the cache when its changed, moving the cache validity check into
	  the parsing loop and factoring some getVar calls outside a for loop
	- Cooker: Remove a debug message from the parsing loop to lower overhead
	- Convert build.py exec_task to use getVarFlags
	- Update shell to use cooker.buildFile
	- Add StampUpdate event
	- Convert -b option to use taskdata/runqueue
	- Remove digraph and switch to new stamp checking code. exec_task no longer
	  honours dependencies
	- Make fetcher timestamp updating non-fatal when permissions don't allow 
	  updates
	- Add BB_SCHEDULER variable/option ("completion" or "speed") controlling
	  the way bitbake schedules tasks
	- Add BB_STAMP_POLICY variable/option ("perfile" or "full") controlling
	  how extensively stamps are looked at for validity
	- When handling build target failures make sure idepends are checked and
	  failed where needed. Fixes --continue mode crashes.
	- Fix problems with recrdeptask handling where some idepends weren't handled
	  correctly.
	- Work around refs/HEAD issues with git over http (#3410)
	- Add proxy support to the CVS fetcher (from Cyril Chemparathy)
	- Improve runfetchcmd so errors are seen and various GIT variables are exported
	- Add ability to fetchers to check URL validity without downloading
	- Improve runtime PREFERRED_PROVIDERS warning message
	- Add BB_STAMP_WHITELIST option which contains a list of stamps to ignore when
	  checking stamp dependencies and using a BB_STAMP_POLICY of "whitelist"
	- No longer weight providers on the basis of a package being "already staged". This
	  leads to builds being non-deterministic.
	- Flush stdout/stderr before forking to fix duplicate console output
	- Make sure recrdeps tasks include all inter-task dependencies of a given fn
	- Add bb.runqueue.check_stamp_fn() for use by packaged-staging
	- Add PERSISTENT_DIR to store the PersistData in a persistent
	  directory != the cache dir.
	- Add md5 and sha256 checksum generation functions to utils.py
	- Make sure Build Completed events are generated even when tasks fail
	- Correctly handle '-' characters in class names (#2958)
	- Make sure expandKeys has been called on the data dictonary before running tasks
	- Correctly add a task override in the form task-TASKNAME.
	- Revert the '-' character fix in class names since it breaks things
	- When a regexp fails to compile for PACKAGES_DYNAMIC, print a more useful error (#4444)
	- Allow to checkout CVS by Date and Time. Just add HHmm to the SRCDATE.
	- Move prunedir function to utils.py and add explode_dep_versions function
	- Raise an exception if SRCREV == 'INVALID'
	- Fix hg fetcher username/password handling and fix crash
	- Fix PACKAGES_DYNAMIC handling of packages with '++' in the name
	- Rename __depends to __base_depends after configuration parsing so we don't
	  recheck the validity of the config files time after time
	- Add better environmental variable handling. By default it will now only pass certain 
	  whitelisted variables into the data store. If BB_PRESERVE_ENV is set bitbake will use
	  all variable from the environment. If BB_ENV_WHITELIST is set, that whitelist will be
	  used instead of the internal bitbake one. Alternatively, BB_ENV_EXTRAWHITE can be used
	  to extend the internal whitelist.

Changes in BitBake 1.8.10:
	- Psyco is available only for x86 - do not use it on other architectures.
	- Fix a bug in bb.decodeurl where http://some.where.com/somefile.tgz decoded to host="" (#1530)
	- Warn about malformed PREFERRED_PROVIDERS (#1072)
	- Add support for BB_NICE_LEVEL option (#1627)
	- Sort initial providers list by default preference (#1145, #2024)
	- Improve provider sorting so prefered versions have preference over latest versions (#768)
	- Detect builds of tasks with overlapping providers and warn (will become a fatal error) (#1359)
	- Add MULTI_PROVIDER_WHITELIST variable to allow known safe multiple providers to be listed
	- Handle paths in svn fetcher module parameter
	- Support the syntax "export VARIABLE"
	- Add bzr fetcher
	- Add support for cleaning directories before a task in the form:
	  do_taskname[cleandirs] = "dir"
	- bzr fetcher tweaks from Robert Schuster (#2913)
	- Add mercurial (hg) fetcher from Robert Schuster (#2913)
	- Fix bogus preferred_version return values
	- Fix 'depends' flag splitting
	- Fix unexport handling (#3135)
	- Add bb.copyfile function similar to bb.movefile (and improve movefile error reporting)
	- Allow multiple options for deptask flag
	- Use git-fetch instead of git-pull removing any need for merges when 
	  fetching (we don't care about the index). Fixes fetch errors.
	- Add BB_GENERATE_MIRROR_TARBALLS option, set to 0 to make git fetches 
	  faster at the expense of not creating mirror tarballs.
	- SRCREV handling updates, improvements and fixes from Poky
	- Add bb.utils.lockfile() and bb.utils.unlockfile() from Poky
	- Add support for task selfstamp and lockfiles flags
	- Disable task number acceleration since it can allow the tasks to run 
	  out of sequence
	- Improve runqueue code comments
	- Add task scheduler abstraction and some example schedulers
	- Improve circular dependency chain debugging code and user feedback
	- Don't give a stacktrace for invalid tasks, have a user friendly message (#3431)
	- Add support for "-e target" (#3432)
	- Fix shell showdata command (#3259)
	- Fix shell data updating problems (#1880)
	- Properly raise errors for invalid source URI protocols
	- Change the wget fetcher failure handling to avoid lockfile problems
	- Add git branch support
	- Add support for branches in git fetcher (Otavio Salvador, Michael Lauer)
	- Make taskdata and runqueue errors more user friendly
	- Add norecurse and fullpath options to cvs fetcher

Changes in Bitbake 1.8.8:
	- Rewrite svn fetcher to make adding extra operations easier 
	  as part of future SRCDATE="now" fixes
	  (requires new FETCHCMD_svn definition in bitbake.conf)
	- Change SVNDIR layout to be more unique (fixes #2644 and #2624)
	- Import persistent data store from trunk
	- Sync fetcher code with that in trunk, adding SRCREV support for svn
	- Add ConfigParsed Event after configuration parsing is complete
	- data.emit_var() - only call getVar if we need the variable
	- Stop generating the A variable (seems to be legacy code)
	- Make sure intertask depends get processed correcting in recursive depends
	- Add pn-PN to overrides when evaluating PREFERRED_VERSION
	- Improve the progress indicator by skipping tasks that have 
	  already run before starting the build rather than during it
	- Add profiling option (-P)
	- Add BB_SRCREV_POLICY variable (clear or cache) to control SRCREV cache
	- Add SRCREV_FORMAT support
	- Fix local fetcher's localpath return values
	- Apply OVERRIDES before performing immediate expansions
	- Allow the -b -e option combination to take regular expressions
	- Add plain message function to bb.msg
	- Sort the list of providers before processing so dependency problems are 
	  reproducible rather than effectively random
	- Add locking for fetchers so only one tries to fetch a given file at a given time
	- Fix int(0)/None confusion in runqueue.py which causes random gaps in dependency chains
	- Fix handling of variables with expansion in the name using _append/_prepend
	  e.g. RRECOMMENDS_${PN}_append_xyz = "abc"
	- Expand data in addtasks
 	- Print the list of missing DEPENDS,RDEPENDS for the "No buildable providers available for required...."
 	  error message.
	- Rework add_task to be more efficient (6% speedup, 7% number of function calls reduction)
	- Sort digraph output to make builds more reproducible
	- Split expandKeys into two for loops to benefit from the expand_cache (12% speedup)
	- runqueue.py: Fix idepends handling to avoid dependency errors
	- Clear the terminal TOSTOP flag if set (and warn the user)
	- Fix regression from r653 and make SRCDATE/CVSDATE work for packages again

Changes in Bitbake 1.8.6:
	- Correctly redirect stdin when forking
	- If parsing errors are found, exit, too many users miss the errors
	- Remove supriours PREFERRED_PROVIDER warnings

Changes in Bitbake 1.8.4:
	- Make sure __inherit_cache is updated before calling include() (from Michael Krelin)
	- Fix bug when target was in ASSUME_PROVIDED (#2236)
	- Raise ParseError for filenames with multiple underscores instead of infinitely looping (#2062)
	- Fix invalid regexp in BBMASK error handling (missing import) (#1124)
	- Don't run build sanity checks on incomplete builds
	- Promote certain warnings from debug to note 2 level
	- Update manual

Changes in Bitbake 1.8.2:
	- Catch truncated cache file errors
	- Add PE (Package Epoch) support from Philipp Zabel (pH5)
	- Add code to handle inter-task dependencies
	- Allow operations other than assignment on flag variables
	- Fix cache errors when generation dotGraphs

Changes in Bitbake 1.8.0:
	- Release 1.7.x as a stable series

Changes in BitBake 1.7.x:
	- Major updates of the dependency handling and execution
	  of tasks. Code from bin/bitbake replaced with runqueue.py
	  and taskdata.py
	- New task execution code supports multithreading with a simplistic
	  threading algorithm controlled by BB_NUMBER_THREADS
	- Change of the SVN Fetcher to keep the checkout around
	  courtsey of Paul Sokolovsky (#1367)
	- PATH fix to bbimage (#1108)
	- Allow debug domains to be specified on the commandline (-l)
	- Allow 'interactive' tasks
	- Logging message improvements
	- Drop now uneeded BUILD_ALL_DEPS variable
	- Add support for wildcards to -b option
	- Major overhaul of the fetchers making a large amount of code common
	  including mirroring code
	- Fetchers now touch md5 stamps upon access (to show activity)
	- Fix -f force option when used without -b (long standing bug)
	- Add expand_cache to data_cache.py, caching expanded data (speedup)
	- Allow version field in DEPENDS (ignored for now)
	- Add abort flag support to the shell
	- Make inherit fail if the class doesn't exist (#1478)
	- Fix data.emit_env() to expand keynames as well as values
	- Add ssh fetcher
	- Add perforce fetcher
	- Make PREFERRED_PROVIDER_foobar defaults to foobar if available
	- Share the parser's mtime_cache, reducing the number of stat syscalls
	- Compile all anonfuncs at once! 
	  *** Anonfuncs must now use common spacing format ***
	- Memorise the list of handlers in __BBHANDLERS and tasks in __BBTASKS
	  This removes 2 million function calls resulting in a 5-10% speedup
	- Add manpage
	- Update generateDotGraph to use taskData/runQueue improving accuracy
	  and also adding a task dependency graph
	- Fix/standardise on GPLv2 licence
	- Move most functionality from bin/bitbake to cooker.py and split into
	  separate funcitons
	- CVS fetcher: Added support for non-default port
	- Add BBINCLUDELOGS_LINES, the number of lines to read from any logfile
	- Drop shebangs from lib/bb scripts

Changes in Bitbake 1.6.0:
	- Better msg handling
	- COW dict implementation from Tim Ansell (mithro) leading
	  to better performance
	- Speed up of -s

Changes in Bitbake 1.4.4:
	- SRCDATE now handling courtsey Justin Patrin
	- #1017 fix to work with rm_work

Changes in BitBake 1.4.2:
	- Send logs to oe.pastebin.com instead of pastebin.com
	  fixes #856
	- Copy the internal bitbake data before building the
	  dependency graph. This fixes nano not having a
	  virtual/libc dependency
	- Allow multiple TARBALL_STASH entries
	- Cache, check if the directory exists before changing
	  into it
	- git speedup cloning by not doing a checkout
	- allow to have spaces in filenames (.conf, .bb, .bbclass)

Changes in BitBake 1.4.0:
	- Fix to check both RDEPENDS and RDEPENDS_${PN}
	- Fix a RDEPENDS parsing bug in utils:explode_deps()
	- Update git fetcher behaviour to match git changes
	- ASSUME_PROVIDED allowed to include runtime packages
	- git fetcher cleanup and efficency improvements
	- Change the format of the cache
	- Update usermanual to document the Fetchers
	- Major changes to caching with a new strategy
	  giving a major performance increase when reparsing
	  with few data changes

Changes in BitBake 1.3.3:
	- Create a new Fetcher module to ease the
	  development of new Fetchers.
	  Issue #438 fixed by rpurdie@openedhand.com
	- Make the Subversion fetcher honor the SRC Date
	  (CVSDATE).
	  Issue #555 fixed by chris@openedhand.com
	- Expand PREFERRED_PROVIDER properly
	  Issue #436 fixed by rprudie@openedhand.com
	- Typo fix for Issue #531 by Philipp Zabel for the
	  BitBake Shell
	- Introduce a new special variable SRCDATE as
	  a generic naming to replace CVSDATE.
	- Introduce a new keyword 'required'. In contrast
	  to 'include' parsing will fail if a to be included
	  file can not be found.
	- Remove hardcoding of the STAMP directory. Patch
	  courtsey pHilipp Zabel
	- Track the RDEPENDS of each package (rpurdie@openedhand.com)
	- Introduce BUILD_ALL_DEPS to build all RDEPENDS. E.g
	  this is used by the OpenEmbedded Meta Packages.
	  (rpurdie@openedhand.com).

Changes in BitBake 1.3.2:
	- reintegration of make.py into BitBake
	- bbread is gone, use bitbake -e
	- lots of shell updates and bugfixes
	- Introduction of the .= and =. operator
	- Sort variables, keys and groups in bitdoc
	- Fix regression in the handling of BBCOLLECTIONS
	- Update the bitbake usermanual

Changes in BitBake 1.3.0:
	- add bitbake interactive shell (bitbake -i)
	- refactor bitbake utility in OO style
	- kill default arguments in methods in the bb.data module
	- kill default arguments in methods in the bb.fetch module
	- the http/https/ftp fetcher will fail if the to be 
	  downloaded file was not found in DL_DIR (this is needed
	  to avoid unpacking the sourceforge mirror page)
	- Switch to a cow like data instance for persistent and non
	  persisting mode (called data_smart.py)
	- Changed the callback of bb.make.collect_bbfiles to carry
	  additional parameters
	- Drastically reduced the amount of needed RAM by not holding
	  each data instance in memory when using a cache/persistent
	  storage

Changes in BitBake 1.2.1:
	The 1.2.1 release is meant as a intermediate release to lay the
	ground for more radical changes. The most notable changes are:

	- Do not hardcode {}, use bb.data.init() instead if you want to
	  get a instance of a data class
	- bb.data.init() is a factory and the old bb.data methods are delegates
	- Do not use deepcopy use bb.data.createCopy() instead.
	- Removed default arguments in bb.fetch