This new citation dialog follows a new design similar to lyx-1.3:

This new citation dialog follows a new design similar to lyx-1.3:
- two panes for Selected/Available keys
- find as you search (Regular expression are supported)
- advanced search button

There are a lot of work still:
- selected citations are not inserted in the document
- find does not select the found key
- the graying/un-graying of buttons does not work properly
- the Advanced Search Dialog (which will search inside the citation) is not done yet
- ...
But the good news is that I have used the Model/View separation of Qt4. QCitation contains the list models and QCitationDialog contains the list views. The idea would be to reuse the model for a new dialog, I am thinking of a simple combo box placed on the toolbar which insert citations with default style, etc. Or a context menu insert->citation...

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@13496 a592a061-630c-0410-9148-cb99ea01b6c8