[Review] Request from 'schubi2' @ 'yast/yast-pkg-bindings/review_140924_flag_onsystem_by_user'

Please review the following changes:
  * 79f724d packaging
  * e3fecfa fixed PkgPropertiesAll
  * c2cb73d moved onSystemByUser to Package.cc
  * 6e7643d fixed name
  * 484da0f taking item pointer
  * 0468414 added onsystem_by_user flag

Um, actually the ONLY use of `PkgPropertiesAll` is the newly added one in https://github.com/yast/yast-autoinstallation/pull/84 . So I think the whole fix could be made much simpler by using `ResolvableProperties` and scheduling `PkgPropertiesAll` for deletion after SLES is out.