Static caching in user_relationships_load_all_for_user prevents effective programmatic usage

Similar to a previous issue reported, the static caching used in user_relationships_load_all_for_user makes it so that once a user's relationships have been loaded, they can't change in the course of a request. This prevents me from using SimpleTest to create relationships and confirm them because it must all happen within one request. There at least needs to be a way to clear the static cache.

function user_relationships_load_all_for_user($uid) {
  static $relationships = array();

  if (!key_exists($uid, $relationships)) {