keys require a user-id

[Robert J. Hansen]

> GnuPG always asks IIRC new users for their Name and email address
> and does not tell them in advance that they can use a free form UID,
> without an email address, thus being able to use a key for multiple
> accounts or purposes, without adding additional UIDs.

It is not the job of the command-line interface to teach users the
subtleties and nuances of OpenPGP.  If users want to know the many
different ways GnuPG can be used they need to read the documentation.

If you think this use-case is important enough it should go in the
manpage or FAQ, let's discuss that.  But the command-line user interface
is the wrong place to be teaching people about unusual use cases.

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