[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

Good question. Before I have changed this I have greped through the code and no one else use it.
Otherwise someone else has already found that bug. E.G. Pkg.PkgPropertiesAll("mc") has returned
properties of ALL packages which are available and installed. Not really useful :-)