Remove code to automatically join Earth -- network joins will now be user-initiated and manual.

node/NodeConfig.cpp

@@ -86,13 +86,6 @@ NodeConfig::NodeConfig(const RuntimeEnvironment *renv,const char *authToken,unsi
 		}
 	}
 
-	// TODO:
-	// This might go away eventually. This causes the LAN called Earth to be
-	// automatically joined if there are no other networks. This is for backward
-	// compatibility with the expectations of previous alpha users.
-	if (nwids.empty())
-		nwids.insert(0x6c92786fee000001ULL);
-
 	for(std::set<uint64_t>::iterator nwid(nwids.begin());nwid!=nwids.end();++nwid) {
 		try {
 			SharedPtr<Network> nw(Network::newInstance(_r,*nwid));