Fixing path to fields file

For this access to the checkpoint files, the work_dir was missing. Hence an HDF5 error occured when running postprocessings from a folder different from the work_dir. This change fixes this problem.

assigned to @chichi

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• a9f13a42 - tweaks default filenames/parameter handling

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• 17112cd5 - fixes parameter conflict

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Well spotted. I went a bit further with cleaning up the handling of iterations/checkpoints, to do everything within the _base class.

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• 2c05c528 - cleans up class, adds important documentation point

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mentioned in commit f159288e

merged