Merge branch 'Fixes' into 'master'

Clean up and Bug Fixes

Closes #38

See merge request pycodegen/pystencils!264
14 jobs for master in 17 minutes and 57 seconds (queued for 2 seconds)
Name Stage Failure
failed
minimal-sympy-master Test
  File "/opt/conda/lib/python3.9/copy.py", line 172, in deepcopy
y = _reconstruct(x, memo, *rv)
File "/opt/conda/lib/python3.9/copy.py", line 272, in _reconstruct
y.__setstate__(state)
File "/opt/conda/lib/python3.9/site-packages/sympy/core/symbol.py", line 313, in __setstate__
for name, value in state.items():
AttributeError: 'tuple' object has no attribute 'items'
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1