classes/packagehistory: fix and extend

* Replace use of BASEPKG_TARGET_SYS which is no longer available
* Replace use of bb.data.getVar(...,d) with d.getVar(...)
* Change the file structure - use single files within PN/package subdirs
  rather than having a subdir level for each part of the version. There
  is a set of files for each recipe and for each package in directories
  underneath.
* Record more information - PACKAGES, DEPENDS, RDEPENDS, RRECOMMENDS,
  FILES, and the total size and a complete list of the packaged files.
* Record the values in simple text format. The "latest" file, rather
  than a symlink has been changed to a copy of the latest file so that
  if it is tracked in a VCS repository (e.g. git) you can compare it
  easily to the previous version.

Implements [YOCTO #1565].

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>

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