[IMG282] Auto find openbeam and darkcurrent based on metadata from ct (!180) · Merge requests · Zhang, Chen / iMars3D · GitLab

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Zhang, Chen requested to merge IMG282_auto_find_obdc into next Oct 06, 2022

Original Gitlab story: IMG282

This PR introduces the following changes:

load_data now can auto detect open beam (ob) and dark current (dc) files based on the metadata in ct file.
- this feature is triggered by setting ob_fnmatch or dc_fnmatch to None.
load_data related unit tests are now using pytest fixture for temp data generation.
add new corresponding unit tests.