New course-roles datastructure in testdata
fixed testdata
adapt update functions to new structure
Merge branch 'repart' of github.com:schuel/hmmm into repart
fix syntax
Debug output when loading test data
Fix replacing usernames with user ids
update filters to look for members
Fix roles again

I took the liberty of removing some cruft too
Fix changing of participation
removed old testdata: course.date
fix participants display
Merge branch 'repart' of github.com:schuel/hmmm into repart
preparing roles in events (testdata)
Merge branch 'repart' of github.com:schuel/hmmm into repart
function to get members having the specified role
Merge branch 'repart' of github.com:schuel/hmmm into repart
return just the user ids
fix saving courses

yeh I'm learning (slowly)
bugfix: course-event-edit shows list of mentors and hosts again
& mentor only shown if listed in roles