This is starter code for the n-body assignment,
15-859E, Hierarchical Methods for Simulation, Sept 1998

View nbody.html with a web browser for the assignment handout.

MODIFICATION LOG:
    22 Sept: created, tested on my SGI
    23 Sept: thresh_screen init changed so nbody.cc will compile on cluster SGI
	now compiles and runs on cluster SGI's and Suns
    2 Oct: added code to nbody.cc to read particle2 file format, randsq.cc
    3 Oct: added circ.p2, orbit.cc
    5 Oct: changed %F to %lf in read_number() so file reader would work on Suns

Paul Heckbert