Should we just remove the broadcast option?

[Hal Murray]

Is anybody using/testing it?

We don't support receiving broadcast.

It used to support a ttl option.  That got broken/dropped somewhere along the way.  Should I restore that?  Or maybe document that it is missing?  ...

Context is that I'm cleaning up the mode/ttl mess.  The mode for refclocks used to live in the ttl slot.  Since the ttl slot isn't used any more, I'm fixing up all the names.

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