Renamed Copy/Cut/Paste, improved tooltip, see trac #11881
Renamed 'Unlink' tag options into 'Remove', see trac #11884
Updated copyrights to include 2014
Changed name/description for user management tab
Adapted description texts in Treeviewer tab toolbars
Implemented Blazej's suggestions

Updated copyright;
Formated code to match CodeTemplate.java;
Synchronized popup menu and tab bar tooltips;
Merge pull request #2159 from dominikl/rebased/develop/cut_copy_paste

Renamed Cut,Copy,Paste,Unlink options (see trac #11880) (rebased onto develop)