Merge branch 'sg/parse-options-subcommand'

The codepath for the OPT_SUBCOMMAND facility has been cleaned up. * sg/parse-options-subcommand: notes, remote: show unknown subcommands between `' notes: simplify default operation mode arguments check test-parse-options.c: fix style of comparison with zero test-parse-options.c: don't use for loop initial declaration t0040-parse-options: remove leftover debugging