* In Person, add event_ref_list to get_citation_child_list (therefore it is no longer needed in get_handle_referents)
* Similarly in Family, add event_ref_list to get_citation_child_list
* Enhance upgrade to add upgrade of event_ref_list for person and family
* Add has_citation_reference, replace_citation_references and remove_citation_references to EventRef
* Change name of remove_citation_refs to remove_citation_references to be consistent with has_citation_reference (singular) and replace_citation_references
Fix editcitation because it was displaying the wrong privacy button for sources.
Also remove FIXME for editcitation for db signal connect, because comment explains why it is not needed.
svn: r18469
Rename remove_citation to remove_citation_refs and make it apply to a citation_handle_list.
Updated tool/Check.py to change check_source_references into check_citation_references
svn: r18433
* renamed HasSourceBase to HasSourceCountBase to reflect function, and because HasSourceBase is changed to be more widely used
* consequent renaming of filters for various object types
* changed source filters to a new 'Citation/source filters' category
* added Citation/_HasSource to check whether Citation refers to a Source with particular properties
* added Person/_HasCitation, Event/_HasCitation and Family/_HasCitation to check whether object refers to a Citation with particular properties
* updated Citation/_MatchesSourceFilter
* updated Rules/_MatchesSourceConfidenceBase
* updated Rules/_MatchesSourceFilterBase
* updated Citation object and citationbase.py for source references
* updated Person/_HasSourceOf
* updated comments in Filters/Rules/__init__.py to document how the various rules are used.
svn: r18339
* Remove inheritance of Citation from RefBase, using source_handle filed instead (similar to the way Family objects store mother and father handles) (also use the set_ and get_reference_handle functions more consistently)
* Use get_citation_list instead of get_citation_references (more consistent with the way notes are handled)
svn: r18100
* 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
* Modified Event object to include references to Citations
* Implemented database upgrade for Events (upgrade for Media had already been done)
* Enhanced database upgrade to do backlinks
* Modified Media object to remove sourceref
* Implemented citations bottombar gramplet
* Some minor fixes and improvements
svn: r18054
* 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
