added wxRETAINED support in wxMotif; changed wxDC::SetBackground behaviour;
changed OnKeyDown/OnChar behaviour; fixed wxToolBar toggle bugs; fixed
wxImage on wxMotif bug whereby new was used to allocate XImage data
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@1677 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775