Log Message:
Update to 1.99.08.
Changes:
	- use flock() on disk images to avoid accidents
	- improve gdb interface to treat CPUs as "threads"
	- rework tty handling; now behaves when backgrounded
	- change disk image names in sample config to match OS/161 usage
	- rework timing code and fix bug with bogus large idle counts
	- rework and retune main loop; much faster
	- use more gcc warnings