User: rename set_user to enable_user
User: rename enable_user to enabled_by_admin
Zanata::User: Add POD; to_string is renamed to to_yaml
Zanata::User: Add POD; to_string is renamed to to_yaml
Zanata::User: Fix enabled_user
Zanata::User: new static method coordinator_set_lang_membership
Change project from file to freemind
Zanata::User: new methods set_prj_maintainership_by_maintainer, maintainer_set_prj_maintainership