+- Added parent window parameter to wxHelpController constructor
+ and added SetParentWindow/GetParentWindow.
+- wxMultiChoiceDialog uses now wxCheckListBox if possible, wxListBox if not.
+- Added wxBitmapButton::SetHoverBitmap()
+- Access to titles through Get/SetTitle is available now only for top level
+ windows (wxDialog, wxFrame).
+- Fixed memory leak of pending events in wxEvtHandler