[Gtkradiant] commited big merge for 1.1-TA-RC2

[Timothee Besset]

I commited a bunch of changes to the CVS tree / Alpha branch. Check the 
CHANGES file and changelog.txt for a list. The plugin API has changed and I 
fixed the main plugins (i.e. the ones that we distribute with the setups).

Most noticeably, the plugin APIs have changed to isolate the UI toolkit - 
dependent stuff into seperate APIs. I've commited an update to the curry 
tree too.

I will be merging bobtoolz in and adapt it to the new APIs now. Then fixing 
linux setup, testing everything and building RC setups.

TTimo