In the run_tests.py script it appears that unittestgui
has changed slightly with new releases.

The line 

unittestgui.main(suites, minimal)

apparently needs to be changed to

unittestgui.main(suites)

for unittestgui 1.7

I didn't check in this change since I am new to
unittestgui and may be using the wrong version.