* dragging an applet creates a top level window so the applet won't appear behind the panel
when dragging, as is the case now.
* dragging leaves a semi transparent version of the applet at the original location, so it's
clear to the user where the applet came from and where it will go when the drag is cancelled.
There are still some open issues, I'm working on those...
svn path=/trunk/KDE/kdebase/workspace/libs/plasma/; revision=806484
*removed Containment::Private::destroyApplet in favour of just calling Applet::destroy() directly.
svn path=/trunk/KDE/kdebase/workspace/libs/plasma/; revision=805666
