Tektronix files from plotutils
https://www.gnu.org/software/plotutils/

This is my poor code for converting the Tektronix plot files to the
format my fortran program uses to plotting on Calcomp plotter.

Note it has fixed sized arrays. Likely will blow up if too many vectors.
Also has lots of stuff left over from debugging and playing that
makes code annoying to read.

Usage
./convert_delta < /tmp/tek2plot/usmap.tek > /tmp/usmap.1
Orig length 120217, pen ups 67
New  length 78161, pen ups 65
num segs 138

The code attempts to sort vectors to reduce pen up motion. New length is
total pen motion after optimization.