Update default.php

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

Without this unable to access AD info. Also allows SSO.
Update settings.php
LDAP: do not bind anonymously if superuser is set FS#2607
browser-based logo resizing in install.php FS#2763

server side resizing now needs a security hash which we can' provide in
the installer, yet.
Merge pull request #204 from senorandy/master

Correctly identify AD account
adjusted authad language files for config option change
strip specials from file name in codeblock downloads FS#2757
removed Satisfy All directive FS#2750
Merge branch 'master' of https://github.com/splitbrain/dokuwiki