Fix up mactrans.py for python3

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@21010 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
6256: Can't create graph reports


git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@21012 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
display error messages correctly

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@21013 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
Bugs 5972 and 6132: needed to remove python-gnome2 to run, GUI Crash (metaclass conflict) when some package (e.g. python-gnome2) installed, 6132: metaclass conflict in flatbasemodel.py

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@21015 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
typo in args error reporting

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@21016 4ae1f11a-8b86-4847-b8af-ab372f36d1fd