(run_or_die): Print command if verbose mode.

(run_or_die): Print command if verbose mode.

(flac2mp3): Pass --quiet and --verbose options to flac and lame as
appropriate.  If --lame-options given, also pass those to lame.
Previously --preset standard was hard-coded, now it is just the
default if --lame-options is not given.

(MAIN): Now take options: --lame-options, -q/--quiet, -v/--verbose,
and -h/--help.