Remove checking of mempool min fee from estimateSmartFee.

This check has been moved to the wallet logic GetMinimumFee. The rpc call to
estimatesmartfee will now no longer return a result maxed with the mempool min
fee, but automated fee calculations from the wallet will produce the same result
as before and coincontrol and sendcoins dialogs in the GUI will correctly
display the right prospective fee.

changes to policy/fees.cpp include a big whitespace indentation change.

src/rpc/mining.cpp

@@ -815,7 +815,6 @@ UniValue estimatesmartfee(const JSONRPCRequest& request)
             "\n"
             "A negative value is returned if not enough transactions and blocks\n"
             "have been observed to make an estimate for any number of blocks.\n"
-            "However it will not return a value below the mempool reject fee.\n"
             "\nExample:\n"
             + HelpExampleCli("estimatesmartfee", "6")
             );
@@ -831,7 +830,7 @@ UniValue estimatesmartfee(const JSONRPCRequest& request)
 
     UniValue result(UniValue::VOBJ);
     FeeCalculation feeCalc;
-    CFeeRate feeRate = ::feeEstimator.estimateSmartFee(nBlocks, &feeCalc, ::mempool, conservative);
+    CFeeRate feeRate = ::feeEstimator.estimateSmartFee(nBlocks, &feeCalc, conservative);
     result.push_back(Pair("feerate", feeRate == CFeeRate(0) ? -1.0 : ValueFromAmount(feeRate.GetFeePerK())));
     result.push_back(Pair("blocks", feeCalc.returnedTarget));
     return result;