Only invited user can register in strict mode,
Set mail server in admin panel,
Switch strict mode in admin panel,
Invite people to system in admin panel
This commit also removes the “import a single Trello card” as we couldn’t figure
out some reasonable use case.
We also create a new publication on the server to provide the minimal user
profile informations required to display an avatar.
The previous users accounts templates configuration only happened on
the client, which was wrong and caused some bugs, for instance an
invalid URL was generated in the reset password e-mail.
Fixes#297