7/11/89: added copyright static var and #ifdef COPYRIGHT for copyright notice
  in frame label

7/17+/89:
	Adding routines in draw.c to write triangulations of spinals
	  to a file.  Also adding supporting code to heisenberg.c
	  (command 'ts' for triangulate spinal).
	Changed heisenberg.c so that arguments to commands are stored
	  internally as strings instead of doubles.  This allows for
	  more versatile commands, such as ones requiring a string
	  (like a file name).

7/19/89:
Changes made to angular parameters:

	OLD:
	double chain_ang_inc = DEGTORAD(10);
	  loop goes from: 0 to 2Pi
	NEW:
	int chain_resolution = 36;
	  chain_ang_inc = 2 Pi / chain_resolution

	OLD:
	double rcircle_ang_inc = DEGTORAD(5);
	  loop goes from: Pi/4 to 3Pi/4 twice,
	  once for each half of the rcircle
	NEW:
	int rcircle_resolution = 36;
	  rcircle_ang_inc = Pi / rcircle_resolution

	OLD:
	double slice_ang_inc = DEGTORAD(6);
	  loop goes from: 0 to Pi
	NEW:
	int slice_count = 30
	  slice_ang_inc = Pi / slice_count

	OLD:
	double rc_rot_inc = DEGTORAD(40);
	  loop goes from: 0 to 2Pi
	NEW:
	int meridian_count = 9
	  rc_rot_inc = 2 Pi / meridian_count 

7/19-20/89:
	Rearranged and prettied up code which draws spinals by
	chains.  Broke it up into pieces, in particular
	compute_spinal_t0 and compute_spinal_slice.
