6786: Invoke editor on double-click in backlinks gramplet

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps34@22954 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
6874: Use shorter names in add gramplet list.  Remove old attributes gramplet.

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps34@22957 4ae1f11a-8b86-4847-b8af-ab372f36d1fd