Create an SVG with a complete cutting pattern

Accept three command-line parameters for the height, width, and thickness
for the deck, and create an SVG with a complete cutting pattern.

The design is based on http://tuckbox.gameupdates.com/.

Limitations:

1) Dimensions are in inches only.
2) Code is not modular.
3) Lines are created with individual line segments.  Should probably use a
   path.
4) No error checking.
5) Only one style of tuckbox.
6) Hard-coded save file.
7) Not thoroughly tested.

Signed-off-by: Timur Tabi <timur@tabi.org>