Add support for ESRF ID27 beamline

[carnisj]

Add support for high-energy BCDI at ID27. The detector is in a SAXS-like geometry, not on a goniometer. The interpolation (taking into account the curvature of Ewald sphere) is currently done with griddata and is very slow. The interpolation using GPU code will be implemented in a separate PR, since this one is already large enough.

Processing for experiments with such a detector are now supported via a separate module bcdi.preprocessing.process_scan_cdi.

The implementation of diffractometers is modified to take into account this so-called SAXS geometry. Parameters corresponding to the detector stages are used instead of detector goniometer angles.

Fixes #264

Type of change

• New feature (non-breaking change which adds functionality)

How has this been tested?

Test with a dataset from ID27.

Checklist:

• I have made corresponding changes to the documentation
• I have added corresponding unit tests
• I have run doit and all tasks have passed

[DSimonne]

Hi,

Overall it looks good, I did not see any particular problem.
For that amount of files I think the best is to test it with data!

I will also have to change a few things in Gwaihir since there are new parameters and scripts

[DSimonne]

Would be nice if Clément checks it as well before merging

[clatlan]

I was having a look as well. It seems fine to me. As @DSimonne suggests the easiest way to proceed is to analyse multiple ID27 scans, maybe @sjleake has some more.

[clatlan]

Or @mirichard-S !