- the 'package' atom within a patch is not a stand-alone resolvable

- the 'package' atom within a patch is not a stand-alone resolvable
  but contains only _additional_ information to augment the package
  created by standard repomd data
- add 'augmentPackage()' to inject this additional metadata into
  an already existing package
  (this does not work as expected since the Package is const.
   So we re-create a new Package from the old and add information)
  (incomplete, currently only dependencies are added. Should add
   also patch_rpm and delta_rpm information)
- dont use 'PackageID' but 'NVRA' which is semantically identical

ToDo:
 strip down 'YUMPatchPackage' to the 'augmentable' information.
 The updated package, the patch refers to, should have all
 information, The 'YUMPatchPackage' should only add information
 relevant for the patch-package relationship.