* updates to citationviews to support all the functionality (add source etc.) provided by sourceview (including different tooltips for tree view and list view)
* moved registration of citationtreeview into view.grp.py
* removed citationtreeview.grp.py module
* fixed update to citation when note is deleted
* fixed update to citation when media object is deleted
* re-enabled edit button in sourcebackreflist
* improved date display in mergecitation
* changed default note type for citation notes
* changed backref in citation editor to CitationBackRefList
* fixed removal of citation handles from the list in primary objects when a citation is deleted
* fixes for pylint
svn: r18095
* Updated merge Sources
* Implemented undo-redo for citations (revision 18069 had only added citations to the undo-redo list, not acted on that types of element)
* Fixed embedded lists for some of the object type editors that were done in Rev 18069
* Modified EditCitation so the source parameter is optional
* Added svn properties for all /src/Merge/merge*.py modules
* Added support for EditCitation from backreflist.py
svn: r18085
