-corrected some bugs in gnome interface: language menu are now

-corrected some bugs in gnome interface: language menu are now
synchronized ; and menus have less chances to be changed when they're opened.

-added basic angle support ; this is a first try. It works with my 2
test-DVDs, but I'd like that people having DVDs with repeated scenes to
test it. We can choose angle with command line option -u (don't ask me
why :)

-a cosmetic change in css decryption.

Since config.h.in has changed, you have to re-run ./configure.