Record that completed experiments are not assignable.
Record that completed experiments are not assignable.

This doesn't feel right; it looks like we need to finish designing the fixed-group-size case.

TurkServer/turkserver-meteor,HarvardEconCS/turkserver-meteor,HarvardEconCS/turkserver-meteor,TurkServer/turkserver-meteor,TurkServer/turkserver-meteor,VirtualLab/turkserver-meteor,VirtualLab/turkserver-meteor,HarvardEconCS/turkserver-meteor,VirtualLab/turkserver-meteor