OC login asks for username or email, but individual account only works with username

[cziaarm]

email is not associated with ownCloud account

[cziaarm]

possibly because provisioned account isn't set up with email only username and password https://github.com/eprintsug/arkivum2/blob/master/cgi/arkivum/users#L19-L20

[cziaarm]

Email added after user creation if user creation succeeds and email is set in eprints user object

• also made getting username from eprints: $repo->current_user as more secure
• and added new user to group as defined by $c->{arkivum}->{file_share_group}