private network support

- protocolversion, networkid global int flags to cli and mist
- fix bug with protocolversion check using wrong db
- log protocolversion & networkid in backend

cmd/ethereum/main.go

@@ -136,8 +136,8 @@ The Ethereum JavaScript VM exposes a node admin interface as well as the DAPP Ja
 		utils.RPCPortFlag,
 		utils.UnencryptedKeysFlag,
 		utils.VMDebugFlag,
-
-		//utils.VMTypeFlag,
+		utils.ProtocolVersionFlag,
+		utils.NetworkIdFlag,
 	}
 
 	// missing:
@@ -327,7 +327,7 @@ GO: %s
 OS: %s
 GOPATH=%s
 GOROOT=%s
-`, ClientIdentifier, Version, eth.ProtocolVersion, eth.NetworkId, runtime.Version(), runtime.GOOS, os.Getenv("GOPATH"), runtime.GOROOT())
+`, ClientIdentifier, Version, c.GlobalInt(utils.ProtocolVersionFlag.Name), c.GlobalInt(utils.NetworkIdFlag.Name), runtime.Version(), runtime.GOOS, os.Getenv("GOPATH"), runtime.GOROOT())
 }
 
 // hashish returns true for strings that look like hashes.