Issue #876-swingx: JXTreeTable - add api for treeExpansionListener  (last open part was event source must be JXTreeTable) - added TreeExpansionBroadcaster and changed JXTreeTable to use it.
Issue #876-swingx: JXTreeTable - add api for treeExpansionListener 
(last open part was event source must be JXTreeTable)
- added TreeExpansionBroadcaster and changed JXTreeTable to use it.

forgot to commit the enhanced TreeExpansionReport

git-svn-id: 9c6ef37dfd7eaa5a3748af7ba0f8d9e7b67c2a4c@3495 1312f61e-266d-0410-97fa-c3b71232c9ac

krichter722/swingx,krichter722/swingx,trejkaz/swingx,trejkaz/swingx,tmyroadctfig/swingx