DesktopLayout branch

[Ambroz Bizjak]

Hi,

I've been working on some improvements to the desktop containment concerning 
applet positioning/transformations. I think the code is ready to be merged 
into trunk. The branches are in svn under branches/work/plasma-desktoplayout. 
I'm also attaching the patches.
Can I merge the code, or does anyone have objections/questions?

To sum up the changes:
- Get rid of the QGraphicsLayout interface from DesktopLayout as it is 
unneeded and not designed for we're doing. A layout is suppose to be the only 
thing manipulating the children, which is not our case (user actions, applets 
resizing themselves).
- Added signals appletTransformedByUsed and appletTransformedItself to 
Plasma::Applet. This makes it easier for the layout code to know when applets 
are transformed (moved/resized/rotated), and it can even know whether the 
change was by the user or the applet itself. Fixes bug 180857. This is needed 
for fixing bug 181841.
- Updated the desktop containment to use these signals.
- Added proper handling of applets resizing themselves to DesktopLayout. E.g. 
if an applet gets larger, applets on its right that are in the way are pushed 
not to overlap.
- Added support for understanding rotations (bug 177152).
- Added emitting of the signals mentioned to some of the applets when they 
resize themselves; more are needed.
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