qingy 0.7.3

- Fixed libgcrypt support. Now it is no longer considered experimental,
and should work as expected :-)
- Fixed session timeout, in case of 'logout' action. Using this feature
no longer exposes users to possible machine lock-ups. Thus, the whole
session timeout feature can now be considered production ready, no longer
experimental.
- Fixed detection of X11 headers and libraries, it should now work
on those distros that put them under /usr/X11R6.