Support "standalone" mode (-a or --standalone) in which we do not connect

to the network and do not close ledgers. This mode makes it much easier to
test transactions as they are only applied once to the open ledger.

src/main.cpp

@@ -84,6 +84,7 @@ int main(int argc, char* argv[])
 	int					iResult	= 0;
 	po::variables_map	vm;										// Map of options.
 	bool				bTest	= false;
+	theConfig.init();
 
 	//
 	// Set up option parsing.
@@ -93,6 +94,7 @@ int main(int argc, char* argv[])
 		("help,h", "Display this message.")
 		("conf", po::value<std::string>(), "Specify the configuration file.")
 		("rpc", "Perform rpc command (default).")
+		("standalone,a", "Run with no peers.")
 		("test,t", "Perform unit tests.")
 		("parameters", po::value< vector<string> >(), "Specify comma separated parameters.")
 		("verbose,v", "Increase log level")
@@ -142,6 +144,11 @@ int main(int argc, char* argv[])
 		Log::setMinSeverity(lsTRACE);
 	}
 
+	if (vm.count("standalone"))
+	{
+		theConfig.RUN_STANDALONE = true;
+	}
+
 	if (!iResult)
 	{
 		theConfig.setup(vm.count("conf") ? vm["conf"].as<std::string>() : "");