This commit duplicates the General settings' User Signup options in
the Website configuration, with a clear description of the options.
We also remove the unnecessary usage of safe_eval in auth_signup's
res_config.py. As stored values are repr values of a boolean field
just comparing the string values is sufficient. There is no need to
use safe_eval as it should be used only when necessary.
Denis Vermylen
689d6d6829