Set obsolete user and group limit field nullable
Merge branch '0.6.4' into dev
Conflicts: snf-astakos-app/astakos/im/forms.py snf-astakos-app/astakos/im/views.py
Fix migration integrity error
Fix migration 0023. Supply limit default value.
Change rename and change quota limit field to bigint
Alter limit column type to bigint
Register resources in quota holder
Fix code formatting to conform to the PEP 8 style guide
Migration fix
Add group homepage field
Refs: #2793
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