This reverts commit ba09710a.

Conflicts:
	lib/plugins/authad/lang/de/settings.php

Correctly identify AD account

server side resizing now needs a security hash which we can' provide in
the installer, yet.

Before this fix the debug parameter always prevent the GIF from being
sent even though no actual debug information was returned unless the
allowdebug configuration option was set. Now the GIF is only disabled if
debugging is actually allowed.

prevent third-party requests from using fetch

process a crop as a resize when possible

backward compatibility for old authtype settings

install.php: Add pack() to required functions (FS#2761)

mechanism supporting "authtype deprecated" message for superusers only

de/de-informal language updates for several components.

for completeness (& defensive coding), test ['show'] against MSG_PUBLIC in case its redefined to a non-zero value

add capability to restrict recipients of dokuwiki 'msg' alerts.  This is useful where message is added to the queue before authentication is initialized

de/de-informal: config plugin - Clean up the TOC in the configuration page / No need to add "Konfiguration" or "Plugin" to every element if the heading tells you that.

For just one image another syntax was used, this fixes the update script
to also fetch this image.

Without this unable to access AD info. Also allows SSO.

Wihtout this, unable to fetch any AD info.. also allows SSO.