List Scheduler using 3 different heuristics.

Build with 'make'

Usage is as follows (also outputed with -h)

usage: ./scheduler [options]
	accepts iloc input on STDIN
	prints output (iloc or dot) on STDOUT
options:
	-a,-b,-c	use one of the schedulers
	-D		emit dot instead of iloc
	-N		emit nops in the iloc code
	-h		show this help