overhauled the main loop. (BIGLOOP) in Loop.cpp.
sigtimedwait() was cutting it, it was queueing up too
many DUPLICATE signals and overflowing the rt signal queue.
now gb has its own real-time signal queueing logic that
just sets the bit of the FDs that need attention.
i think threaded reads/writes are better now too but
the performance graph is broken so i need to fix that first.
the threads page looks good though. overhaul this hopefully
is a massive and stable performance improvement.