added a metadata expiry check/refresh to init hook on user/login and saml_login. made log timestamps consistent.

updated default metadata path. added function to pull expire data from metadata. added expire data to metadata refresh log entry

disallow logging in with or resetting passwords for local accounts when auth type is set to simplesamlphp

Issue1

See merge request !2

permission check for simplesaml admin added to auth type form elements. disabled username and email for simplesaml users.

Merge auto cron key branch

Merge code that auto-detects cron key.

See merge request !1