// We need to find out if $contact_nick is a user on this hub, and if so, if I
// am a contact of that user. However, that user may have other contacts with the
// same nickname as me on other hubs or other networks. Exclude these by requiring
// that the contact have a local URL. I will be the only person with my nickname at
// this URL, so if a result is found, then I am a contact of the $contact_nick user.
// We need to find out if $contact_nick is a user on this hub, and if so, if I
// am a contact of that user. However, that user may have other contacts with the
// same nickname as me on other hubs or other networks. Exclude these by requiring
// that the contact have a local URL. I will be the only person with my nickname at
// this URL, so if a result is found, then I am a contact of the $contact_nick user.