public. Retrieve information about a given user.
Output:
<user name="{text}">
<ldap-dn>{text}</ldap-dn>
<date.created>{date}</date.created>
<firstname>{text}</firstname>
<lastname>{text}</lastname>
<phonenumber>{text}</phonenumber>
<email>{text}</email>
<description>{text}</description>
<groups>
<group name="{text}">
<ldap-dn>{text}</ldap-dn>
</group>
...
</groups>
</user>