Automatic commit: rename auth/ into helios_auth/
Automatic commit: replace auth by helios_auth everywhere

git ls-files|xargs sed -i -r 's/(\W|^)auth(\W|$)/\1helios_auth\2/g'
Manual review and fix of previous commit

 * keep "/auth/" in URLs
 * revert unrelated uses of "auth" in comments and facebookclient
 * fix migration scripts to cope with the renaming of the SQL table
   "auth_user" to "helios_auth_user"
Fix path to templates in helios_auth.view_utils