GitLab

- Use django-tables2 to render table

Conflicts:
	snf-astakos-app/astakos/im/templates/im/projects/project_list.html
	snf-astakos-app/astakos/im/views.py

Change astakos user registration procedure in order to send to quotaholder 0 instead of None (infinite)

Update Astakos API to provider calls for retrieving uuid from the username and vice versa, extend astakos client library (snf-common) and update pithos to use uuids instead of email for account identification

improves table view development by spliting table data access and presentation
onto separate layers.

Exceptions regarding limit violations now carry details
as specified in CommissionValueException

- Handle invalid login after auth method add request
- Fix auth method add for unauthenticated users
- Third party auth providers helper methods in astakos.im.target module
- Provider login url template tag that handles code,key,next url params

'/im' does not work if APPEND_SLASH django setting is set to False