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/qt/popupwin.h

@@ -0,0 +1,23 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        wx/qt/popupwin.h
+// Author:      Peter Most
+// Copyright:   (c) Peter Most
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_QT_POPUPWIN_H_
+#define _WX_QT_POPUPWIN_H_
+
+class WXDLLIMPEXP_CORE wxPopupWindow : public wxPopupWindowBase
+{
+public:
+    wxPopupWindow();
+    wxPopupWindow(wxWindow *parent, int flags = wxBORDER_NONE);
+
+protected:
+
+private:
+    DECLARE_DYNAMIC_CLASS(wxPopupWindow)
+};
+
+#endif // _WX_QT_POPUPWIN_H_