mnemonic

I would like to propose that the mnemonic specification gets into the RFC-XXXX.
It seems too much effort to track what is going on about headers etc
to really have such a small RFC as the mnemonic around, and it does
not seem more peculiar than rich-text or other specialities now
in the draft.

As EUnet and Nordunet really fancy this format, it would be a good thing to
have mnemonic included in RFC-XXXX.

Keld