Refactor and servercard ajustments

pb/messages.proto

@@ -102,10 +102,10 @@ message ServerCard {
     string description=2; // description : owner type (company/private/university...), 
     string publicKey = 3; // public key you must use to send encrypted messages to that server
     string url = 4; // meow server url
-    bool publish = 5; // publish this server when asked for a list by server
-    bytes signature = 6; // signature of all previous fields by the server itself
-    int32 confidenceLevel = 7; // additional info from the user
-}
+    string login = 5; // required login to access the server
+    string password = 6; // password associated to the login
+    string signature = 7; // signature of all previous fields by the server itself
+    }
 
 // structure describing a user contact card ie the minimum set of attributes for exchanging identities
 message ContactCard {