Make orphan logging more verbose, displaying mapOrphanTransactions.size()

Old log message:
	storing orphan tx df2244f6bc

New log message:
	storing orphan tx df2244f6bc (mapsz 51)

Also, trim a few trailing whitespace in main.cpp.

src/main.cpp

@@ -2704,7 +2704,9 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         }
         else if (fMissingInputs)
         {
-            printf("storing orphan tx %s\n", inv.hash.ToString().substr(0,10).c_str());
+            printf("storing orphan tx %s (mapsz %d)\n",
+                   inv.hash.ToString().substr(0,10).c_str(),
+                   mapOrphanTransactions.size() + 1);
             AddOrphanTx(vMsg);
 
             // DoS prevention: do not allow mapOrphanTransactions to grow unbounded