Adding pythonpath variable

[davethepunkyone]

Description

This adds the pythonpath option to pytest.ini with the location set to the base of the project.

Context

Depending on the users configuration, sometimes pytest isn't able to see modules it needs to see. This just sets the pythonpath to the default to hopefully help those users.

This has been added thanks to the information provided by @andrew-cleveland.

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes (where appropriate)
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

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