athinst is a program to assist in network
installation of Sun workstations at MIT.
It may not be useful in any other environments.

It's targetted at singly-homed machines right now.

Outline:

	1.	Startup and figure out what interface to listen on.
	2.	Find the INSTALLER address for that interface and make sure
		it's not in use.
	3.	Start listening for RARPs, and answer them with the
		INSTALLER address.
	4.	Start listening for TFTPs and answer them with
		the magic cnboot-type forth.


lossage:
  if there's no floppy in the drive when rcS runs from the install server
  the machine hangs for 5 minutes. SUCK.