user terms are loaded multiple times!

For reasons I don't understand, hook_user() $op 'load' is called multiple times, as this snippet of code shows.

function user_terms_load_profile(&$account) {
  static $count;
  $count++;
  dsm($count);
  // ....

I've no idea why this is, as we seem to be using hook_user correctly, so to speed things up I'm going to add a check of the $user property we set.

Leaving this as postponed in case there's some weirdness somewhere and a proper way to fix it.