morse(6): update documentation

- bump Dd
- use 'r' instead of 'D' from the original submission

Unbreak build after r327614

Approved by: mjg (on IRC)
Differential Revision: https://reviews.freebsd.org/D13782

morse(6): minor nits

- Use copyright comment header
- Make it easier to compile on !FreeBSD
- Diff reduction against DragonFlyBSD

morse(6): implement support for decoding morse code

- Use `-r` for "reverse" mode and to match DragonFlyBSD.
- Move defines around to clear up logic
- use `errx` instead of `fprintf` and `exit`

PR:

morse(6): implement support for decoding morse code

- Use `-r` for "reverse" mode and to match DragonFlyBSD.
- Move defines around to clear up logic
- use `errx` instead of `fprintf` and `exit`

PR: 35109
Submitted By: [email protected]
Submitted on: 2002-02-19
Reviewed by: kevans

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morse(6): fix two typod

morse(6): add a few missing characters

- add ñ, ', and _
- remove lint support
- add missing header for ioctl