update copyright year to 2019

tests/json_buffer.cpp

 /** Unit tests for buffer
  *
  * @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
- * @copyright 2017-2018, Institute for Automation of Complex Power Systems, EONERC
+ * @copyright 2014-2019, Institute for Automation of Complex Power Systems, EONERC
  * @license GNU General Public License (version 3)
  *
  * VILLAScommon

tests/kernel.cpp

 /** Unit tests for kernel functions.
  *
  * @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
- * @copyright 2017-2018, Institute for Automation of Complex Power Systems, EONERC
+ * @copyright 2014-2019, Institute for Automation of Complex Power Systems, EONERC
  * @license GNU General Public License (version 3)
  *
  * VILLAScommon

tests/list.cpp

 /** Unit tests for array-based list
  *
  * @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
- * @copyright 2017-2018, Institute for Automation of Complex Power Systems, EONERC
+ * @copyright 2014-2019, Institute for Automation of Complex Power Systems, EONERC
  * @license GNU General Public License (version 3)
  *
  * VILLAScommon

tests/logging.cpp

 /** Logging utilities for unit test.
  *
  * @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
- * @copyright 2017-2018, Steffen Vogel
+ * @copyright 2014-2019, Steffen Vogel
  * @license GNU General Public License (version 3)
  *
  * VILLAScommon

tests/task.cpp

 /** Unit tests for periodic tasks
  *
  * @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
- * @copyright 2017-2018, Institute for Automation of Complex Power Systems, EONERC
+ * @copyright 2014-2019, Institute for Automation of Complex Power Systems, EONERC
  * @license GNU General Public License (version 3)
  *
  * VILLAScommon

tests/timing.cpp

 /** Unit tests for time related utlities
  *
  * @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
- * @copyright 2017-2018, Institute for Automation of Complex Power Systems, EONERC
+ * @copyright 2014-2019, Institute for Automation of Complex Power Systems, EONERC
  * @license GNU General Public License (version 3)
  *
  * VILLAScommon

tests/tsc.cpp

 /** Unit tests for rdtsc
  *
  * @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
- * @copyright 2018, Institute for Automation of Complex Power Systems, EONERC
+ * @copyright 2014-2019, Institute for Automation of Complex Power Systems, EONERC
  * @license GNU General Public License (version 3)
  *
  * VILLAScommon

tests/utils.cpp

 /** Unit tests for utilities
  *
  * @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
- * @copyright 2017-2018, Institute for Automation of Complex Power Systems, EONERC
+ * @copyright 2014-2019, Institute for Automation of Complex Power Systems, EONERC
  * @license GNU General Public License (version 3)
  *
  * VILLAScommon