commit -- suffixes and Win32 Save As

[Paul Rohr]

If there's no suffix we now add one, based on the filter chosen in the Win32 
Save As dialog.  Fixes #464. 

  M src/af/xap/win/xap_Win32Dlg_FileOpenSaveAs.cpp

Make UT_pathSuffix() a little more XP-friendly. 

  M src/af/util/xp/ut_misc.cpp

Paul