Added validate_new_group to cleaning and removed clean_new_club_link_id.
This new cleaning method is a general purpose method for cleaning the form of a new group or group_app.
Patch by: Lennard de Rijk
Reviewed by: to-be-reviewed
Coverage: code coverage testing for Python
Coverage.py is a Python module that measures code coverage during test execution.
It uses the code analysis tools and tracing hooks provided in the Python standard
library to determine which lines are executable, and which have been executed.
For more information, see http://nedbatchelder.com/code/modules/coverage.html