Remove lint.

Remove lint.
(long_options, usage, main): -y is now -I (for --bzip).
(usage): Fix misspelling.
(OPTION_STRING): -y is now -I.
(decode_options): Use -1, not EOF, for getopt_long result.
Fix typo when invoking xstrtoumax: look for LONGINT_OK, not LONG_MAX.
Handle operands after any "--" argument.
(main): Report any output errors.