Merge branch 'random_paranoia' into 'NIFTy_6'

Be more paranoid about initializing the RNG

See merge request !426

nifty6/__init__.py

 from .version import __version__
 
+from . import random
+random.seed(42)
+
 from .domains.domain import Domain
 from .domains.structured_domain import StructuredDomain
 from .domains.unstructured_domain import UnstructuredDomain

nifty6/random.py

@@ -11,13 +11,17 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
-# Copyright(C) 2013-2019 Max-Planck-Society
+# Copyright(C) 2013-2020 Max-Planck-Society
 #
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik.
 
 import numpy as np
 
 
+def seed(seed):
+    np.random.seed(seed)
+
+
 class Random(object):
     @staticmethod
     def pm1(dtype, shape):