Sort attribute values for consent

Prevent an assert by only calling a sub-search if needed

rewrite getServerPort

All descendants overload this function anyway

Also fixes edge-case situation where $_SERVER['SERVER_PORT'] is not set for an HTTPS connection, this function would return an explicit port 80 i.e. ":80" rather than an empty string.

As per mailinglist-discussion, consent-stats were never processed by the statistics-module due to inconsistent logging:
https://groups.google.com/forum/#!topic/simplesamlphp/Gc97OeUox2k

Merge branch 'feature/pdo-options-support' of https://github.com/ElijahLynn/simplesamlphp into ElijahLynn-feature/pdo-options-support

authfacebook compatability with Facebook strict URI match

Replace deprecated create_function

The assignment to $stateID is dead and can be removed.

Call to undefined method Memcached::getExtendedStats()

Notice: Undefined index: libevent in modules/memcacheMonitor/templates/memcachestat.tpl.php on line 60

Per https://developers.facebook.com/docs/facebook-login/security/#strict_mode the
`state` parameter should be used for any state needed after the redirect, and the
redirect URI should remain constant.

Trailing slash is no longer required in baseurlpath as per 1.15.

This picks up the case where the memberof attribute is an empty
array as well as not being an array