AES-NI vectorization improvements

See merge request pycodegen/pystencils!46

CI: Add minimal-sympy-master

See merge request pycodegen/pystencils!50

Close pystencils' config file after writing

See merge request pycodegen/pystencils!51

Actually increment counter inside random_symbol

See merge request pycodegen/pystencils!49

Add pyhtml to tests and artifacts

See merge request pycodegen/pystencils!41

Fix typo in "pre-push"

See merge request pycodegen/pystencils!44

Add PyPI badge

See merge request pycodegen/pystencils!45

in unit testing without display plots, the same figure would be used
over and over again. This is problematic when mixing 3D and 2D axes

If this line
from setuptools import find_packages, setup
is run after
from distutils.extension import Extension

a wrong Extension class is used

Basic support for OpenCL (experimental)

See merge request pycodegen/pystencils!29

Fix get_type_of_expression for constants like sympy.pi

See merge request pycodegen/pystencils!35

Problem some constant expressions are neither Float,Integer,Rational but
don't have arguments.

>>> isinstance(pi, Integer)
False
>>> isinstance(pi, Float)
False
>>> isinstance(pi, Rational)
False
>>> pi.args
()

Implement sp.Sum, sp.Product

See merge request !38

Contest: ignore two more files if waLBerla is not available

See merge request !40