investiage pylint issue E0401

[Kwasniok]

See __init__.py in domains module. Pylint assumes a wrong path (adds src) for some of the relative imports.
issued in pylint/issues/5319

Checked so far

• cyclic import
• missing object referenced
• cleared cache

Workarounds:

• cwd in src
• modify .pylintrcto include

[MASTER]
init-hook='import sys; sys.path.append(".")'