Move `settxfee` from rpcblockchain to rpcwallet

`settxfee` only affects the wallet, not the block chain.

src/rpcblockchain.cpp

@@ -127,30 +127,6 @@ Value getdifficulty(const Array& params, bool fHelp)
 }
 
 
-Value settxfee(const Array& params, bool fHelp)
-{
-    if (fHelp || params.size() < 1 || params.size() > 1)
-        throw runtime_error(
-            "settxfee amount\n"
-            "\nSet the transaction fee. 'amount' is a real and is rounded to the nearest 0.00000001\n"
-            "\nArguments:\n"
-            "1. amount         (numeric, required) The transaction fee in btc rounded to the nearest 0.00000001\n"
-            "\nResult\n"
-            "true|false        (boolean) Returns true if successful\n"
-            "\nExamples:\n"
-            + HelpExampleCli("settxfee", "0.00001")
-            + HelpExampleRpc("settxfee", "0.00001")
-        );
-
-    // Amount
-    int64_t nAmount = 0;
-    if (params[0].get_real() != 0.0)
-        nAmount = AmountFromValue(params[0]);        // rejects 0.0 amounts
-
-    nTransactionFee = nAmount;
-    return true;
-}
-
 Value getrawmempool(const Array& params, bool fHelp)
 {
     if (fHelp || params.size() > 1)

src/rpcserver.cpp

@@ -237,7 +237,6 @@ static const CRPCCommand vRPCCommands[] =
     { "getrawmempool",          &getrawmempool,          true,      false,      false },
     { "getblock",               &getblock,               false,     false,      false },
     { "getblockhash",           &getblockhash,           false,     false,      false },
-    { "settxfee",               &settxfee,               false,     false,      true },
     { "getrawtransaction",      &getrawtransaction,      false,     false,      false },
     { "createrawtransaction",   &createrawtransaction,   false,     false,      false },
     { "decoderawtransaction",   &decoderawtransaction,   false,     false,      false },
@@ -294,6 +293,7 @@ static const CRPCCommand vRPCCommands[] =
     { "listunspent",            &listunspent,            false,     false,      true },
     { "lockunspent",            &lockunspent,            false,     false,      true },
     { "listlockunspent",        &listlockunspent,        false,     false,      true },
+    { "settxfee",               &settxfee,               false,     false,      true },
 
     /* Wallet-enabled mining */
     { "getgenerate",            &getgenerate,            true,      false,      false },

src/rpcwallet.cpp

@@ -2066,3 +2066,28 @@ Value listlockunspent(const Array& params, bool fHelp)
     return ret;
 }
 
+Value settxfee(const Array& params, bool fHelp)
+{
+    if (fHelp || params.size() < 1 || params.size() > 1)
+        throw runtime_error(
+            "settxfee amount\n"
+            "\nSet the transaction fee. 'amount' is a real and is rounded to the nearest 0.00000001\n"
+            "\nArguments:\n"
+            "1. amount         (numeric, required) The transaction fee in btc rounded to the nearest 0.00000001\n"
+            "\nResult\n"
+            "true|false        (boolean) Returns true if successful\n"
+            "\nExamples:\n"
+            + HelpExampleCli("settxfee", "0.00001")
+            + HelpExampleRpc("settxfee", "0.00001")
+        );
+
+    // Amount
+    int64_t nAmount = 0;
+    if (params[0].get_real() != 0.0)
+        nAmount = AmountFromValue(params[0]);        // rejects 0.0 amounts
+
+    nTransactionFee = nAmount;
+    return true;
+}
+
+