[GNU Crypto] ISignature constants

[Casey Marshall]

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I just noticed that the attribute key constants for digital signatures
(SIGNER_KEY, SOURCE_OF_RANDOMNESS, and VERIFIER_KEY) are members of the
BaseSignature class and not of ISignature, going against the usual
scheme of having these constants in the top-level interface.

Ok to move these constants to ISignature?

- -- 
Casey Marshall || address@hidden
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