Re Qt frontend

[Angus Leeming]

Kalle, do you subscribe to lyx-cvs? If so, I won't post these redundant 
messages.

Anyway, I fixed the crash in citation dialog. It was a trivial xforms->qt 
thing. See the Changelog.

The dialog is looking very pretty but the ButtonController is busted. If you 
need any help, you know where to come!

Angus