Add a getutxos command to the p2p protocol#4

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adamjonas wants to merge 1 commit intobitcoin-fresheyes-master-4351from mikehearn-fresheyes-getutxo-4351

+89-2

Commits on Aug 11, 2014

Add a getutxos command to the p2p protocol. It allows querying of the UTXO set
mikehearn
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