FlatField: use class directly on arrays
About
This MR adds a class FlatFieldArrays (and its cuda counterpart). It is needed by !104 (merged).
The rationale is, it is cumbersome to use FlatField by providing DataUrl objects instead of arrays for flats/darks.
One should decouple data reading from processing.
This is the first step toward an API change for FlatField.
To do
-
Create FlatFieldArrays -
Deprecation warning -
Ensure tests are passing -
End-to-end reconstruction test
Edited by Pierre Paleo