- Add `User.mainKey` field to store a reference to the corresponding `Key`,
allowing to simplify calling some `User` methods.
- Rename `User.sign` to `User.certify`, since it's used for third-party
certifications and not as a counterpart of `User.verify`, which deals with
self-signatures.
- Change `Key.update` behaviour to store a copy of newly added users and
subkeys. Pointing to the same instance could give issues as the lists of
certifications and signatures could be altered by both the source key and the
updated one.
Breaking changes in `User` methods:
- `User.constructor(userPacket)` -> `constructor(userPacket, mainKey)`
- `User.sign(primaryKey, signingKeys, date, config)` -> `.certify(signingKeys,
date, config)`
- `User.verify(primaryKey, date = new Date(), config)` -> `.verify(date = new
Date(), config)`
- `User.verifyCertificate(primaryKey, certificate, verificationKeys, date = new
Date(), config)` -> `.verifyCertificate(certificate, verificationKeys, date =
new Date(), config)`
- `User.verifyAllCertifications(primaryKey, verificationKeys, date = new
Date(), config)` -> `.verifyAllCertifications(verificationKeys, date = new
Date(), config)`
- `User.isRevoked(primaryKey, certificate, keyPacket, date = new Date(),
config)` -> `.isRevoked(certificate, keyPacket, date = new Date(), config)`
- `User.update(sourceUser, primaryKey, date, config)` -> `.update(sourceUser,
date, config)`
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