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Cdi regrid devel

Jerome Kieffer requested to merge jerome.kieffer/PyNX:CDI_regrid_devel into devel

Mainly: a script to project many 2D frames taken from a BLISS-nexus file into a 3D volume.

Performs the background correction, masking, Ewald's sphere curvature correction, features oversampling and zooming.

The script uses OpenCL, runs well on Nvidia and AMD cards, can accommodate for limited memory on the GPU and works (slowly) on CPU. Each image is projected as many times as needed to rebuild the full volume.

Validated on 615 Eiger2 frames projected on 2048³ volume.

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