Coil form generation. You need OpenSCAD from https://openscad.org for
your machine of choice.

Windows:
  Edit Makefile, uncomment the Windows section and comment out the Linux
  section per its instructions. In cmd window:

   vcvars32
   make
   make install

  Puts the executable coil.exe in c:\local

Linux:
   make
   sudo make install

   Puts the executable coil in /usr/local/bin.

