Added AUTHORS.txt and removed copyright information from individual files

AUTHORS.txt

+
+Contributors:
+-------------
+
+  - Martin Bauer <martin.bauer@fau.de>
+  - Stephan Seitz <stephan.seitz@fau.de>
+  - Jan Hönig <jan.hoenig@fau.de>
+  - Nils Kohl <nils.kohl@fau.de>
+  - Julian Hammer <julian.hammer@fau.de>
+  - Christian Godenschwager <christian.godenschwager@fau.de>
+  - Markus Holzer <markus.holzer@fau.de>
+  - Michael Kuron <mkuron@icp.uni-stuttgart.de>
+  - Dominik Ernst <dominik.ernst@fau.de>
+  - João Victor Tozatti Risso <joaovictortr@protonmail.com>

pystencils_tests/test_cuda_known_functions.py

-# -*- coding: utf-8 -*-
-#
-# Copyright © 2019 Stephan Seitz <stephan.seitz@fau.de>
-#
-# Distributed under terms of the GPLv3 license.
-
-"""
-
-"""
 import sympy
 
 import pystencils

pystencils_tests/test_custom_backends.py

-# -*- coding: utf-8 -*-
-#
-# Copyright © 2019 Stephan Seitz <stephan.seitz@fau.de>
-#
-# Distributed under terms of the GPLv3 license.
-
-"""
-
-"""
 from subprocess import CalledProcessError
 
 import pycuda.driver
@@ -52,7 +43,6 @@ def test_custom_backends():
 
 
 def main():
-
     test_custom_backends()
 
 

pystencils_tests/test_destructuring_field_class.py

-# -*- coding: utf-8 -*-
-#
-# Copyright © 2019 Stephan Seitz <stephan.seitz@fau.de>
-#
-# Distributed under terms of the GPLv3 license.
-
-"""
-
-"""
 import sympy
 
 import pystencils

pystencils_tests/test_global_definitions.py

-# -*- coding: utf-8 -*-
-#
-# Copyright © 2019 Stephan Seitz <stephan.seitz@fau.de>
-#
-# Distributed under terms of the GPLv3 license.
-
-"""
-
-"""
-
 import sympy
 
 import pystencils.astnodes