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Several usability tweaks, some of which change the API.
Forward-port to newer crypto-pubkey(-types) API for DSA keys.
Forward-port to conduit 1.0 API and other changes.
Updated for conduit 0.4 and cereal-conduit 0.0.6; unfortunately the latter makes the API unpleasant, so the next release should be API-incompatible again.
v0.2 - much of signature verification is broken