Replace KAction::associateWidget() with a set of methods to permanently associate / dissociate a widget with an action collection.  This does 
not change the shortcut context, in contrast to the methods that I removed about a month ago; this approach was thought to be ok (in 
comparison to the one I removed) because it does not cause modification of the actions being added to the collection.

Also, add all xmlgui client actions to the top level main window.

These two changes fix bug 151421 and duplicates / related bugs.

It is BIC as I have removed the old associateWidget(), for which I will commit patches to the rest of KDE which use it now.

BUG:151421

svn path=/trunk/KDE/kdelibs/; revision=744418