wm2 Code

* Duh -- last-minute change to the location of that last edit stopped it
from working... fixed now.
* Revert an unintended commit.

* Enable composite redirects for all top-level windows, if the
composite extension is detected and CONFIG_USE_COMPOSITE is set.
This tiny change makes wmx enormously faster on certain modern
video cards (most noticeably the ATI card I'm using at the moment,
which is appallingly bad at normal accelerated window operations).
It will probably make things slower on other systems, so may need
more testing.

* tag for wmx-7

* Update README and UPDATES file
* Make the configure actually do something if a requirement is not
found!
* Remove some obsolete doc bits

* Oops

* Add note about CONFIG_NO_BUTTON

* Patch from Ben Stern via wmx mailing list, to apparently reduce the
chances of losing keyboard focus when switching channels away from
certain applications. Not yet tested. For some reason I never
received the email with this in it, I've only just found it in the
list archive.

...

* Include hidden clients in stacking list -- panels/taskbars/etc seem to
expect the same clients in both stacking and client lists

...