Merge wxQT branch into the trunk.

This merges in the latest sources from GSoC 2014 wxQt project with just a few
minor corrections, mostly undoing wrong changes to common files in that branch
(results of a previous bad merge?) and getting rid of whitespace-only changes.
Also remove debug logging from wxGrid.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77455 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/checkbox.h

@@ -178,6 +178,8 @@ private:
     #include "wx/gtk1/checkbox.h"
 #elif defined(__WXMAC__)
     #include "wx/osx/checkbox.h"
+#elif defined(__WXQT__)
+    #include "wx/qt/checkbox.h"
 #endif
 
 #endif // wxUSE_CHECKBOX