users can now write blog posts for the group page
renamed: withWaitinglist to hasWaitinglist
renamed: registrationOpen to isRegistrationOpen
waiting list now stored in resource (step 1)
waiting list addition moved to resource instead of „old“ waiting list
waiting list is now read from activities (step 2)
Oops, one renaming was missing...
waitinglist is now read from activities even in UI (step 2b)
Now we check against the activity waitinglist whether somebody is eligible to subscribe (step 3).
Now the UI sets the registration time period in the activity waitinglist. Finally, we could get rid of the waitinglistStore. (step 4)
Oops, we should rather save the activity... (step 4b)
Now the waitinglist accepts each registrant only once.
Merge pull request #528 from NicoleRauch/master

Waitinglist is now stored in each activity
migration script for moved waiting lists
resource must know its name to create proper waiting list entries
resourceName now field in WaitinglistEntry and parameter of constructor
removed ‚canSubscribe‘ from waitinglistAPI
small cleanup
adding to waiting list now redirects to login warning if not logged in
changed text in gdcr page