* 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
Added Citations to undo-redo feature.
Moved Citation view within navigation pane to below Sources.
Removed useless edit button from sourcebackreflist.
Fixed default bottombar gramplets for citations.
svn: r18069
* Changed database to introduce Citations
* Introduced new Citation Primary object and CitationBase (equivalent to CitationRef) child object
* Implemented CitationTreeModel and CitationListModel
* Implemented CitationTreeView and CitationListView for new citation views in the navigator
* Implemented EditCitation which is used both for the citation views in the navigator and for the citations of an object
* Implemented the CitationEmbedList to display the citations of an object
* Modified the bottom bar gramplets to support citations
* Implemented the citation selector.
* Modified Media object to include references to Citations
* Initial work on deleting citations
svn: r17960
