Add verbose boolean to getrawmempool

Also changes mempool to store CTxMemPoolEntries
to keep track of when they enter/exit the pool.

src/coins.cpp

@@ -178,3 +178,19 @@ bool CCoinsViewCache::HaveInputs(const CTransaction& tx)
     }
     return true;
 }
+
+double CCoinsViewCache::GetPriority(const CTransaction &tx, int nHeight)
+{
+    if (tx.IsCoinBase())
+        return 0.0;
+    double dResult = 0.0;
+    BOOST_FOREACH(const CTxIn& txin, tx.vin)
+    {
+        const CCoins &coins = GetCoins(txin.prevout.hash);
+        if (!coins.IsAvailable(txin.prevout.n)) continue;
+        if (coins.nHeight < nHeight) {
+            dResult += coins.vout[txin.prevout.n].nValue * (nHeight-coins.nHeight);
+        }
+    }
+    return tx.ComputePriority(dResult);
+}