update snf-manage command in notification email text
ask acknowledgment for switching local account to shibboleth one
support shibboleth with invitations & enable modifyuser command to remove a user group
Refs: #2167
add support for groups
change authentication methods: progress I
merge with master
improve approval terms template
Refs: #2019
Force user to accept service terms
Merge branch 'master' of https://code.grnet.gr/git/astakos
fix welcome email
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