Refactor message encoding into protocol package. User Agent must be now provided in the Init function.

Peernet.go

@@ -6,8 +6,15 @@ Author:     Peter Kleissner
 
 package core
 
+var userAgent = "Peernet Core/0.1" // must be overwritten by the caller
+
 // Init initializes the client. The config must be loaded first!
-func Init() {
+// The User Agent must be provided in the form "Application Name/1.0".
+func Init(UserAgent string) {
+	if userAgent = UserAgent; userAgent == "" {
+		return
+	}
+
 	initFilters()
 	initPeerID()
 	initUserBlockchain()