Improve reduced darks/flats handling
About
Follow-up of !192 (closed).
Complete re-write of nxflatfield.py, benefiting from tomoscan doing most of the work.
Close #313 (closed) #305 (closed) #296 (closed)
To do
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Rewrite nxflatfield.py, use tomoscan features -
Update unit tests -
End-to-end tests
Edited by Pierre Paleo