Support link field type

I managed to exchange date type, so the problem I currently have is only with the link field. It's probably because that field is different from other fields, because it has separate fields for url, title and attributes in the database. All the other CCK fields seem to have _value field for the actual data, which doesn't exist for the link CCK fields.

I got this working by modifying the module to check also url field from database instead of only reading value field. I haven't tested this much, but it seems to work with a trivial homepage field which I have used on both relying and providing sides.

Yea, I did this patch to match my needs, but there is some problem because after this patch it only transfers the url fields. I cannot figure out why, since my php knowledge is not on a jedi level. The if sentence below seems to return true always, so it never gets the value field in the else branch:

<?php
      //Check if it's a CCK link field
      if (isset($profile->{$mapping[$field]}[0]['url'])) {
        return $profile->{$mapping[$field]}[0]['url'];
      }
      //Check if it's a CCK field
      else {
          return $profile->{$mapping[$field]}[0]['value'];
      }
?>

Found the problem, it was in _openid_cp_field_populate_field(), where I check if the field is a link field. Now it works with this fixed patch, but more testing should be done.