* in class Extender rename setExtenderAppearance to setAppearance.
* in class ExtenderItem rename moveBackToSource to returnToSource.
* in class ExtenderItem addition of showCloseAction() and hideCloseAction().
... and some minor tweaks in the implementation.
svn path=/trunk/KDE/kdebase/workspace/libs/plasma/; revision=879670
* Removed sourceApplet() function, it has no place in public api. That was also discussed in the api review, but I forgot to actually remove it.
* Update sourceApplet's pointer and remove the "return to source" button when the source applet is removed.
svn path=/trunk/KDE/kdebase/workspace/libs/plasma/; revision=875290