- Sequoia now ignores any unhashed subpackets when comparing
    signatures, closing a DoS vector.  Previously, one could create
    any number of valid signatures from a single valid signature that
    were considered distinct by mutating the unhashed subpacket area.

  - Sequoia now handles malformed UserIDs of the form "$addr <$addr>".
    Adjust database::test::test_bad_uids accordingly.

  - Update src/dump.rs from Sequoia.

  - Sequoia now ignores any Unicode codepoint considered whitespace
    when parsing Fingerprints and KeyIDs.  Fixes #122.