kwindowsystem high level functions

[Damian Ivanov]

I think that Thomas Luebking agrred with me on this:
 http://osdir.com/ml/kde-devel/2014-02/msg00063.html

except closeWindow I also see missing

 void setBlockingCompositing(bool active);
 void setShowingDesktop(bool showing);
 void setNumberOfDesktops(int numberOfDesktops);

It would be only natural to have them in kwindowsystem.h as that's
already the place where
you check for their values, get notified about their changes etc.

Kind regards.