Introduce default assignment simplifications

There are many simplifications in pystencils that are usually not applied. They can be applied now by using a simple argument in the configuration.

Fixes #39 (closed)

.gitlab-ci.yml

@@ -238,8 +238,6 @@ pycodegen-integration:
   when: manual
   allow_failure: true
   script:
-    - source /opt/conda/etc/profile.d/conda.sh
-    - conda activate pystencils_dev
     - git clone https://gitlab-ci-token:${CI_JOB_TOKEN}@i10git.cs.fau.de/pycodegen/pycodegen.git
     - cd pycodegen
     - git submodule sync --recursive
@@ -261,6 +259,7 @@ pycodegen-integration:
     - cmake --version
     - cmake -DWALBERLA_BUILD_WITH_PYTHON=1 -DWALBERLA_BUILD_WITH_CUDA=1 -DWALBERLA_OPTIMIZE_FOR_LOCALHOST=1 -DWALBERLA_BUILD_WITH_CODEGEN=1 -DPython_EXECUTABLE=/opt/conda/envs/pystencils_dev/bin/python3.8 ..
     - make -j ${NUM_CORES} pythonModuleInstall
+    - cd ../../
     - mkdir -p ~/.config/matplotlib
     - echo "backend:template" > ~/.config/matplotlib/matplotlibrc
     - cd pystencils