Get CI green (address pylint)

[jatkinson1000]

Currently the CI checks fail for pylint (added in #25 ).
Whilst some of these are legitimate to ignore (variable names) others hint at the need for some refactoring and will be addressed in some other issues.

After looking at these we should then return to place any ignores that we feel are legitimately warranted.

Issues to tackle that will help address this:

• Single Classification wrapper function #24
• HcParams leads to a complicated interface #2

[jatkinson1000]

Short variable name warnings will be dealt with in an upcoming release of PyLint: pylint-dev/pylint#8813