Update README.rst
[RoleUser] Removed global RoleUser
[Tests] Refactored tests using superuser
[Test] Fixed failing test
Refactor roles and meeting code
Refactor user, added user details
[Test] Test for admin user list
[RoleUser] Global RoleUser is back
[admin] Prevent users from revoking their superuser right.
[admin] Prevent users from deleting their staff entry.
[staff] Hide is_superuser checkbox.
[testing] Add tests for is_superuser changes.
[meeting] Require meeting type in order to add meetings.
[testing] Test no meeting type warning.
[utils] Refactor copy_attributes.
[phrases] Clone default phrase description correctly.
[template] Hide None value.