Key rotation allows you to specify a timestamp, and any money controlled by any keys created before that time will be automatically respent to keys created after it.
1) Switch the outpoint index field to be uint32 and fix isCoinBase() to consider the unsigned versions only. Resolves issue 420.
2) Regenerate the protobuf and fix an out of date definition in WalletProtobufSerializer that it exposed.
Wallet: Remove/deprecate NOT_IN_BEST_CHAIN as a confidence type.
TxConfidence: Rename NOT_SEEN_IN_CHAIN -> PENDING which is more precise and consistent.
PeerGroup: Fix definition of "mined"