improves configurability. adds command-line opts. reorgs some color handling.

Moves quite a lot, if not all remaining, color handling from Koike::Part
to Koike.

adds command-line options: --moveto-color --cut-color --material-color
--mark-start-color --mark-end-color

fixes some syntax errors by disambiguating a few push statements

removes insistance that the svg output be a complete html file by adding
the 'inc_html' config option to Koike.pm. inc_html is true by default.

removed some useless comments and unused color handling code from
Koike::Part