Removed the 'delete selected' action from SubmissionAdmin.
Removed the 'delete selected' action from SubmissionAdmin.

It's too similar to 'remove', and we want to keep the removed
questions around just in case.

caktus/django-opendebates,caktus/django-opendebates,caktus/django-opendebates,caktus/django-opendebates