Wrap long lines.
Allow zoom to 1/32.

Sometimes I want to look at a track in fine detail, perhaps to
understand quantization.  I find the default limit of 1/8 meter per
pixel too constraining, and I don't find allowing the user to zoom in
a bit to be problematic.
Merge pull request #1 from gdt/whitespace-README

Wrap long lines.
Merge pull request #2 from gdt/maxzoom

Allow zoom to 1/32.
workaround netbsd nan bug