Released netscript version 1.6.6.

added -Z, system logging support, for when netscript is running at a syslog accessible level. changed -u, will now apply the supplementary groups to the id change. also, if no group id is specified, will apply the group id of the user id. changed the ns_exit() module function to pass the type of exit. changed the $` execution comparision variable, to be more like $=. changed minor handling of command line arguments. changed the make/compile procedure, slighty.