minor formatting changes.  This file is going away anywan.
Removed gcode.py.  It was a good prototype.
All G Codes implemented, appear to generate good S-code.
Standalone programs for G-Code: shell and interact.
shell reads G-Code, writes S-code, like cat or sed.
interact is a REPL with readline.
home.gco - first example G-Code script.
Now uses functools.wraps() in decorator.
Better comments.