* Add icon for citations view
* disable old sourceview
* change citationtreeview to be Sources navigation view
* citationlistview is now the Citations view
* merge libcitationview into citationlistview and citationtreeview, and corrected and rationalised
* remove libcitationview
* corrected initialisation of source_handle in Citation.py
* fixes for preventing same source being edited twice
- fixed blockedtext in citationembededlist
- override build_window_key in editcitation.py
svn: r18211
* 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
* 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
