added missing copyrights

Environment/BaseExponential.h

+
 /*
- * (c) Copyright 2019 CORSIKA Project, corsika-project@lists.kit.edu
+ * (c) Copyright 2018 CORSIKA Project, corsika-project@lists.kit.edu
  *
  * See file AUTHORS for a list of contributors.
  *

Environment/SlidingPlanarExponential.h

+
 /*
- * (c) Copyright 2019 CORSIKA Project, corsika-project@lists.kit.edu
+ * (c) Copyright 2018 CORSIKA Project, corsika-project@lists.kit.edu
  *
  * See file AUTHORS for a list of contributors.
  *

Framework/Utilities/sgn.h

+
+/*
+ * (c) Copyright 2018 CORSIKA Project, corsika-project@lists.kit.edu
+ *
+ * See file AUTHORS for a list of contributors.
+ *
+ * This software is distributed under the terms of the GNU General Public
+ * Licence version 3 (GPL Version 3). See file LICENSE for a full version of
+ * the license.
+ */
+
 #ifndef _utilities_sgn_h
 #define _utilities_sgn_h
 

Main/Environment.h

@@ -8,3 +8,5 @@
  * Licence version 3 (GPL Version 3). See file LICENSE for a full version of
  * the license.
  */
+
+

Main/Stack.h

@@ -8,3 +8,5 @@
  * Licence version 3 (GPL Version 3). See file LICENSE for a full version of
  * the license.
  */
+
+

Processes/UrQMD/UrQMD.cc

+
+/*
+ * (c) Copyright 2018 CORSIKA Project, corsika-project@lists.kit.edu
+ *
+ * See file AUTHORS for a list of contributors.
+ *
+ * This software is distributed under the terms of the GNU General Public
+ * Licence version 3 (GPL Version 3). See file LICENSE for a full version of
+ * the license.
+ */
+
 #include <corsika/geometry/QuantityVector.h>
 #include <corsika/geometry/Vector.h>
 #include <corsika/particles/ParticleProperties.h>

Processes/UrQMD/UrQMD.h

+
+/*
+ * (c) Copyright 2018 CORSIKA Project, corsika-project@lists.kit.edu
+ *
+ * See file AUTHORS for a list of contributors.
+ *
+ * This software is distributed under the terms of the GNU General Public
+ * Licence version 3 (GPL Version 3). See file LICENSE for a full version of
+ * the license.
+ */
+
 #ifndef _Processes_UrQMD_UrQMD_h
 #define _Processes_UrQMD_UrQMD_h
 

Processes/UrQMD/testUrQMD.cc

+
 /*
- * (c) Copyright 2019 CORSIKA Project, corsika-project@lists.kit.edu
+ * (c) Copyright 2018 CORSIKA Project, corsika-project@lists.kit.edu
  *
  * See file AUTHORS for a list of contributors.
  *