sip_session2: order items in :help the same way as the commands appear in the source code

darcs-hash:20090422081619-b2873-7d5b88e1e1dbb08dd4b7008c108e139b33236009
sip_session2: change commands order in the source code and in the help screen

darcs-hash:20090422082456-b2873-b60b1f2535b3759ff6603c93885a461f2a64c057