View and management commands for adding/removing user resource quota
Refs: #2793
Merge branch '0.6.4' into dev
Conflicts: snf-astakos-app/astakos/im/forms.py snf-astakos-app/astakos/im/settings.py snf-astakos-app/astakos/im/views.py
Display resource limit details
Fix group search
Add sorting parameter validation
Change pagination in group list
Fix members sorting in group detail
Reduce database interaction in group_detail
Do now allow owner to leave group: remove link from group search
Minor changes in group list
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