alock r90

i did some bugfixes for the r90, the most important one was to handle "AllowDeactivateGrabs" and "AllowClosedownGrabs" if set in xorg.conf. these options basically allow to bypass any program which grabs the keyboard by just pressing ctrl+alt+divide. not so nice when you wanted to lock the session :)

http://alock.googlecode.com/files/alock-svn-90.tar.bz2

sha1 should be 3fa17ecbbea502134ac181b49b55b171d722bb74