Add several address-related indexes and provide new RPC functionalities useful for wallet servers and exchanges.
The implementation will be based on this old PR https://github.com/bitpay/bitcoin/pull/6/files, it needs to be retrofitted to the current master and tested.
The new RPC methods will be:
getaddresstxids getaddressdeltas getaddressbalance getaddressutxos getaddressmempool getblockhashes getspentinfo getrawtransaction (enriched response from current method )
described here: https://bitcore.io/guides/bitcoin/#new-rpc-methods-and-updates