bbaebc6b1b
#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