The POST data contained the raw data instead of an array with the data
that should be submitted like in the requests from the browser. The
server backend has been fixed to be able to process both versions.

reloading the user list after the delete action will make sure the count
is always correct.

This is needed to replace the password generator by a plugin
implementation. Related to PR #166 and FS#2147

Do not pass timelimit and deref settings to ldap_search. These values
should be set globally via ldap_set_option() instead (as we do for
deref).

This reverts commit 37764cbb.

adLDAP renamed the ad_username and ad_password to admin_username
admin_password recently. this makes our backend recognize the old
settings

again)