+ /** Enable a snomask.
+ * @param letter The snomask letter to enable. Once enabled,
+ * server notices may be routed to users with this letter in
+ * their list, and users may add this letter to their list.
+ * @param description The descriptive text sent along with any
+ * server notices, at the start of the notice, e.g. "GLOBOPS".
+ * @return True if the snomask was enabled, false if it already
+ * exists.
+ */