* In lib/ldap/functions.php3 only ask for the cn attribute in ldap_search not the...

* In lib/ldap/functions.php3 only ask for the cn attribute in ldap_search not the whole entry. That should make
  user_finger a lot faster when the user database is in ldap
* In lib/functions.php3 pass a second argument to date2timediv with the current time. user_finger calls that
  function for each online user so we now don't need to do a lot of calls to time() but only one. That should make
  user_finger somewhat faster.