Diffraction Experiment Toolbox
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A CCTBX-style tookbox to describe single-crystal diffraction experiments, where
a monochromatic beam is used to illuminate a sample which is rotated during
the exposure and diffraction recorded on a flat area detector.

This toolbox will include code for:

 - reading image headers
 - transforming contents of image header to standard (i.e. imgCIF) frame
 - python models of experiment

Initially implementing to support xia2 development and make more general for
supporting other detectors.
