Moved CInPoint to core. Removed GetMinFee from CTransaction and made it a regular function in main.

src/core.h

@@ -11,6 +11,8 @@
 
 #include <stdio.h>
 
+class CTransaction;
+
 /** An outpoint - a combination of a transaction hash and an index n into its vout */
 class COutPoint
 {
@@ -50,4 +52,17 @@ public:
     }
 };
 
+/** An inpoint - a combination of a transaction and an index n into its vin */
+class CInPoint
+{
+public:
+    CTransaction* ptx;
+    unsigned int n;
+
+    CInPoint() { SetNull(); }
+    CInPoint(CTransaction* ptxIn, unsigned int nIn) { ptx = ptxIn; n = nIn; }
+    void SetNull() { ptx = NULL; n = (unsigned int) -1; }
+    bool IsNull() const { return (ptx == NULL && n == (unsigned int) -1); }
+};
+
 #endif