Fixed TxRawResult/Vin structure and added GetBlockCmd verbose flags

Changed TxRawResult to omitempty block info for mempool tx as well as
moved Txid to Vin.TxId from Vin.ScriptSig.Txid (both match bitcoind
output)

Added support for new bitcoind [verbose=true] and added non-standard
optional verboseTx to return TxRawResults intead Txids