4000 clients on lightest

Tested new code, with 4000 clients added to 4 machines and server
running on ug142.
map.region_min_width = 4
map.region_min_height = 4
map.region_max_width = 8
map.region_max_height = 8
quest = 1 or 0
lightest
server.overloaded_level = 1250
server.light_level = 1000