wm2 Code

* Make it possible to focus on desktop with a mouse click
* Remove ability of clients to set their own layer explicitly (layers no
longer match up with original mwm spec)
* Move utility windows to a lower layer

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* remove debug

* add support for "utility" type windows (previously overlooked)
* avoid calling gotoChannel when a NETWM channel request for current channel
is received (avoids channel number flashing up when selecting e.g. client
from gnome taskbar)

* update TODO

* Merge back to trunk from NETWM branch. This includes a "getting there"
degree of support for the NETWM extended window manager hints, for use
with compliant desktop frills like those in GNOME and KDE. Thanks to
Jamie Montgomery for providing much of the initial work on this way back
in 2000!

* This merge also provides a fix to UTF8 support in title bars
* and session manager support.

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* Fixes to session management. wmx should now tell the session manager to
restart it.

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