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Introduce new per-txout CCoinsViewCache functions
The new functions are: * CCoinsViewCache::AddCoin: Add a single COutPoint/Coin pair. * CCoinsViewCache::SpendCoin: Remove a single COutPoint. * AddCoins: utility function that invokes CCoinsViewCache::AddCoin for each output in a CTransaction. * AccessByTxid: utility function that searches for any output with a given txid. * CCoinsViewCache::AccessCoin: retrieve the Coin for a COutPoint. * CCoinsViewCache::HaveCoins: check whether a non-empty Coin exists for a given COutPoint. The AddCoin and SpendCoin methods will eventually replace ModifyCoins and ModifyNewCoins, AddCoins will replace CCoins::FromTx, and the new AccessCoins and HaveCoins functions will replace their per-txid counterparts. Note that AccessCoin for now returns a copy of the Coin object. In a later commit it will be change to returning a const reference (which keeps working in all call sites).
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