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/Config.cpp

@@ -40,6 +40,11 @@
 
 Config theConfig;
 
+void Config::init()
+{
+	RUN_STANDALONE = false;
+}
+
 void Config::setup(const std::string& strConf)
 {
 	boost::system::error_code	ec;