Remove the MDI notebook tab from DEPRECATED.   Since it should work without error on all platforms now. Also no longer save unused tree item handles to avoid    compiler warnings with recent versions of gcc.
Remove the MDI notebook tab from DEPRECATED.
  Since it should work without error on all platforms now.
Also no longer save unused tree item handles to avoid 
  compiler warnings with recent versions of gcc.


OS2World/LIB-DynamicWindows,OS2World/LIB-DynamicWindows,OS2World/LIB-DynamicWindows