Add the use_sha256 config option.

Force the use of the SHA256 hash for password storage instead of relying on
the default algorithm from BCRYPTPasswordManager.  This option forces
consistency with the current values in the database tables but may not
be the best available algorithm on a given system.
Add the login_form_class option.

The login_form_class option allows the LoginForm class to be replaced by
the application in the same manner that register_form_class overrides the
RegisterForm class.
Enable the email_validate option.

When the email_validate option is set to 'true', user records are created
with active = 'N' and an email is sent to the user to ensure the address is
valid.
Add email_report_recipients and email_report_prefix options.

Email reports allow system administrators to be notified via email
when a registration-related activity occurs.  If the email_report_prefix
option is specified, the email subject line is prepended with its value.