migrated index_list tests to pystencils

8 jobs for fix_single_link in 4 minutes and 52 seconds (queued for 3 seconds)
Name Stage Failure
minimal-sympy-master Test
  File "/builds/da15siwa/pystencils/pystencils/cpu/cpujit.py", line 61, in <module>
from pystencils.backends.cbackend import generate_c, get_headers
File "/builds/da15siwa/pystencils/pystencils/backends/__init__.py", line 1, in <module>
from .cbackend import generate_c
File "/builds/da15siwa/pystencils/pystencils/backends/cbackend.py", line 23, in <module>
from sympy.printing.ccode import CCodePrinter # for sympy versions < 1.1
ModuleNotFoundError: No module named 'sympy.printing.ccode'
Cleaning up file based variables
ERROR: Job failed: exit code 1