Fix flake8 errors/warnings about import in cubicweb/_exceptions.py We either ignore errors in case of name re-exports and drop re-exports from old backwards compatibility. We fix the only occurrence of NoSelectableObject being imported from cubicweb in tests and update the import to use lgc instead.

[bdist_wheel]
universal = 1

[check-manifest]
ignore =
  debian
  debian/*
  cubicweb.spec
  __pkginfo__.py