Use a typedef for monetary values

src/amount.h

@@ -0,0 +1,13 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2014 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_AMOUNT_H
+#define BITCOIN_AMOUNT_H
+
+#include <stdint.h>
+
+typedef int64_t CAmount;
+
+#endif