It is convenient for me to change this for use in XHTML output, but I also

It is convenient for me to change this for use in XHTML output, but I also
have been wanting to change it for a while. It is not very useful to have
a bunch of years listed in the citations TOC (which you get if you have used
\citeyear very often. Better, it seems to me, to see the citation keys.

Of course, this can be switched again if need be, and I can figure out a
different way to handle my own problem.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@30053 a592a061-630c-0410-9148-cb99ea01b6c8