Fix group_list view in case current user is not of any groupor does not participate in any group
Merge branch 'dev' of https://code.grnet.gr/git/astakos into dev
Conflicts: snf-astakos-app/astakos/im/forms.py snf-astakos-app/astakos/im/views.py
Merge branch '0.6.4' into dev
merge with 0.6.4
Add group tables sorting & decrease interaction with database
Merge branch '0.6.4' of https://code.grnet.gr/git/astakos into 0.6.4
Sorting + Pagination bug
Fix migration integrity error
handle limit conditions in timeline charging
enhance timeline form, traffic charging support
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