There is no way to run our linting configuration directly with pycodestyle

During !638 (merged) we had the following discussion:

• @cs-shadow started a discussion: (+1 comment)

  nit: Is is possible to put this in a separate section so that pycodestyle also works in the same way when used directly, i.e outside of pytest?

It seems that pytest-pycodestyle will not pick up configuration in a [pycodestyle] block. This is unfortunate, since it means we can't run pycodestyle using our configuration directly. For now, this is a leftover from the pep8 days, but we should change this.

Ideally we would change upstream to read the usual configuration blocks, but finding a way to do this without duplicating the configuration could be acceptable.