Frederik Hennig authored Feb 02, 2021 and Markus Holzer committed Feb 02, 2021

- Now applying pre-simplification on CQE, too
- Added zero and alias insertion
- Bugfix

This restructuring allows for easier separation of modules into
separate repositories later. Also, now pip install with repo url can be
used.

The setup.py files have also been updated to correctly reference each
other. Module versions are not extracted from git state

- CSE has to be done after dynamic relaxation rate adaption

- test run again
- notebooks not yet

- Previously sympy.Eq was used to represent assignments. However Eq
  represents equality not assignment. This means that sometimes sympy
  "simplified" an equation like a = a  to True,
-> replaced sp.Eq by pystencils.Assignment everywhere
- renamed EquationCollection to AssignmentCollection

-> equilibrium is constructed according to maximum entropy principle
-> many sqrts in equilibrium formulation