Allowing "duplicate" signatures

Mon Aug 6 01:07:01 2001

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As it stands, GnuPG refuses to sign a key/name pair with a particular
key if a signature by that signing-key already exists.  There are
several reasons that you might want to do that, though.  As noted
in the code, the existing signature could be revoked.  Similarly,
it could be expired.  You might also want to generate a new
signature with new properties (subpacket values):
    new expiration time;
    new signature type (not yet selectable, but I'd like it to be);
    different notation data;
    different "trust signature" value, or associated regular expression; or,
    different exportability.

I recognize that these are somewhat unusual circumstances, and
there is value in pointing out that a signature already exists.

I propose adding a command-line switch to override the duplicate
checking.  I'd be happy to contribute a patch for it... any
suggestions on the name for the switch, or on another approach?