The changes are essentially of three types.
First, the std::maps previously used here for storing BibTeX data have become full-fledged classes and so what were previously just a bunch of functions have now become methods of these new classes. This leads to a lot of minor changes in other files, to adapt to the new signature. The changes in insets/ are mostly of this kind.
Second, there are some slightly more substantial changes in src/insets/InsetBibtex.cpp. We now store lists of the field names and entry types that have been used.
Finally, there are the changes to the citation UI. These are mostly straightforward, though adding the new functionality exposed some inadequacies in the previous code that also had to be fixed.
One other change: BibTeX keys are now docstring. This solves some Unicode issues.
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@19657 a592a061-630c-0410-9148-cb99ea01b6c8
