* now by default Gateways DO NOT SPAWN execution threads
you can call "remote_init_threads(NUM)" on an already instantiated
gateway, which will install a loop on the other side which will
dispatch each execution task to its own thread.
* execution is dissallowed on the side which initiates a gateway
(rarely used, anyway)
* some cleanups (hopefully)
--HG--
branch : trunk
hpk