[FIX]Fix regression PluginTrackerList view=user doesn't show anymore user's items, reported in https://dev.tiki.org/item5126 . A new setting 'userCanSeeOwn' in the tracker definition allows previous behavior when used through Plugin TrackerList with param view=user. Direct access to the user to see the full record of his user items is not allowed either, as in previous Tiki branches before the regression. Thanks jonnyb for feedback and pointers, as usual. Please, help to have a third look to this commit (I double checked myself, but my skills are limited), since it touches a few tracker files.