Adaption to pystencils's new type system

Adapts lbmpy to pystencils's new type system

.gitlab-ci.yml

@@ -128,10 +128,11 @@ minimal-windows:
     - source /cygdrive/c/Users/build/Miniconda3/Scripts/activate
     - source activate pystencils
     - pip install git+https://gitlab-ci-token:${CI_JOB_TOKEN}@i10git.cs.fau.de/pycodegen/pystencils.git@master#egg=pystencils
+    - python -c "import numpy"
+    - pip install sympy==1.9
     - env
     - pip list
-    - python -c "import numpy"
-    - py.test -v -m "not longrun" lbmpy_test/test_quicktests.py
+    - py.test -v -m "not longrun" test_quicktests.py
 
 minimal-sympy-master:
   stage: test