Fix display in Adobe Reader

RGB values are 0 to 1, not 0 to 255. Also, rg is a shortcut to using cs
& sc (as I should have been doing).
Restore graphics state before adding text

Wrapping the existing operations in qQ prevents changes to the ctm
disturbing our added text.
Use argparse in scripts
Fix type of scheming.py param
Improve gitignore
Match curves and multiple forms per character

This is because P1318-006b.pdf contains at least three (3!) ways of
drawing Ss. It also draws Es differently (without the zero-len m
operations) and zeros differently as well.

Curves will be helpful for parentheses too.