Add rpc command 'getunconfirmedbalance' to obtain total unconfirmed balance

Conflicts:
	src/rpcserver.cpp

src/rpcwallet.cpp

@@ -767,6 +767,15 @@ Value getbalance(const Array& params, bool fHelp)
     return ValueFromAmount(nBalance);
 }
 
+Value getunconfirmedbalance(const Array &params, bool fHelp)
+{
+    if (fHelp || params.size() > 0)
+        throw runtime_error(
+                "getunconfirmedbalance\n"
+                "Returns the server's total unconfirmed balance\n");
+    return ValueFromAmount(pwalletMain->GetUnconfirmedBalance());
+}
+
 
 Value movecmd(const Array& params, bool fHelp)
 {