fixicon branch moved where the change in the code was needed.

Display icon on MacOSX (iconfix)

See merge request !17

I believe this will fix MacOSX not displaying the icon. #30

Positional args can again intermix with options

See merge request !14

The move from optparse to argparse caused a regression: positional
arguments could no longer intermix with optional arguments.  This fixes
that. (As of Python 3.7, parse_intermixed_args solves the problem,
but we want to support 2.6, maybe 2.5.)

Resolve "More information than just "Unable to create plot.""

Closes #10

See merge request !5

Ensure value range isn't 0.0 #20

Closes #20

See merge request !11

Convert from optparse to argparse #15

See merge request !8

Resolve "RuntimeWarning with stats when stddev==0.0"

Closes #19

See merge request !10

Force the range to be -0.1 through 0.1. This is what matplotlib does
anyway, and this suppresses a warning.

Slightly simpler, smaller, and easier to style. As a bonus, you can
copy/paste them.