Pawel plesniak/remove xml

[PawelPlesniak]

Description

There was a change of configuration extension from e.g. run_conf1.data.xml to run_conf1.xml.data. This was not announced and is not accounted for in the gitignores, as such mistakenly got merged in. This PR deletes the file and corrects the gitignore.

Type of change

• Documentation (non-breaking change that adds or improves the documentation)
• New feature (non-breaking change which adds functionality)
• Optimization (non-breaking, back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (whatever its nature)

Key checklist

• All tests pass (eg. python -m pytest)
• Pre-commit hooks run successfully (eg. pre-commit run --all-files)

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added or an issue has been opened to tackle that in the future.
  (Indicate issue here: # (issue))

[PawelPlesniak]

MSQT run and passed.

[emmuhamm]

LGTM thumbsup