Finish the improvements I planned.

- No more manual args manipulation -- getopts used for everything.
  As a result, options can be in any position, now, even before the
  subcommand.
- The additional options for test, bench, and dist now appear in the
  help output.
- No more single-letter variable bindings used internally for large
  scopes.
- Don't output the time measurement when just invoking 'x.py'
- Logic is now much more linear.  We build strings up, and then print
  them.

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