0003428: When running with pythonw.exe, Windows may crash if you write to stdout. Some more print statements changed to log.warning. Using same message as rev 21505 for gramps40.

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps34@21513 4ae1f11a-8b86-4847-b8af-ab372f36d1fd