(For those interested: this is intented to extend the space between
characters to help people learning morse code by giving the brain some
extra time for acoustical pattern recognition.)
Note: I slightly cleaned up the submitted patch for minor stylistic
issues, and changed the default for the new -c option to be identical
to -w.
Submitted by: "Stephen P. Cravey" <cravey@gotbrains.org> N5UUU
MFC after: 2 weeks
PR: bin/81831
bc48d6e6c9