[IMG156] add intensity fluctuation correction filter for imar3d_v2 (!145) · Merge requests · Zhang, Chen / iMars3D · GitLab

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Zhang, Chen requested to merge IMG156_ifc_corr_filter into next May 18, 2022

Original Gitlab Story: IMG156

This PR introduces the following changes:

Intensity fluctuation correction via tomopy.normalize_bg (when air region/pixel specified).
Intensity fluctuation correction via skimage (when air region specified with negative value).
corresponding unit tests.