Some light refactoring.
Remove trailing whitespace chars.
pep8
Get rid of log dependency.
Be consistent with Rust dist.
Elide super when reasonable.
Get rid of super where it's not needed.
Doco fixes.
Remove Unicode unfriendly Perl char classes.
Prep regex-dna benchmark for Rust.
Skip the line length checks for long regexps.
Do things right and satisfy the Show trait.