#include <plasma/foo.h>
in headers in libplasma. this is important so that they can be used post-install by third party plugins, apps, etc.
also, changed Applet::loadDataEngine to just Applet::dataEngine and make it actually return the data engine; move the applets to using it. safer and fewer LoC
svn path=/trunk/KDE/kdebase/workspace/lib/plasma/; revision=670850
* add a resetLayout() so layouts can release LayoutItems on deletion, avoiding dangling pointers and possible crashes
svn path=/trunk/KDE/kdebase/workspace/plasma/lib/; revision=668931