bossac: add -V/--version command-line option
bossac: add -V/--version command-line option

  * It's helpful to get the version number without the whole verbose
    help text. Add -V/--version option for this like many other utilities.
  * Move help text for -h/-V to the bottom of the list so they're not
    mixed in with other behavior options.
  * Exit with a success return code (0) instead of failure (1) on -h/-V,
    as is conventional.

shumatech/BOSSA,shumatech/BOSSA,shumatech/BOSSA