+/**
+ * @brief Updates the avatar links in a contact only if needed
+ *
+ * @param string $avatar Link to avatar picture
+ * @param int $uid User id of contact owner
+ * @param int $cid Contact id
+ * @param bool $force force picture update
+ *
+ * @return array Returns array of the different avatar sizes
+ */
+function update_contact_avatar($avatar,$uid,$cid, $force = false) {