Port to newest cclib. Use metricstore as library.

internal/api/authentication.go

@@ -1,3 +1,8 @@
+// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.
+// All rights reserved. This file is part of cc-metric-store.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
 package api
 
 import (