New session management support

[Carsten Schaar <nhadcasc fs-maphy uni-hannover de>]

Moin Tom,

finally, I managed to get my new session management stuff into gnome.
Due to heavy work at my job and some problems with my internet
connection, it took a little bit longer than I expected.
So I  would like you to put my stuff into the cvs repository (possibly
after having a critical eye on it), because I only have anonymous
access to it.  You can find the new code at:

http://www.fs-maphy.uni-hannover.de/~nhadcasc/download/gnome-client.diff.tar.gz

The tar-file includes four new files (gnome-client.[ch] and
client.[cx]) and a diff (gnome.diff) for the changes against a
snapshot from monday evening. The 'gnome-client' file replace the
'gnome-session' files in 'libgnomeui' the 'client' file replace the
'session' files in 'guile-gnome'.
The guile support isn't working correctly yet, but it's quite
usable. The code has some problems with C enum's. 
I also updated all programms that use session management. 

If you have some questions, feel free to ask ;-)

Tschuess, Carsten

PS: I have not yet changed to argument parsing, but I have some slight 
ideas about it.

-- 
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Carsten Schaar                         email: nhadcasc@fs-maphy.uni-hannover.de