Fast-dp

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* Report beam centre correctly in ispyb.xml for multi-panel
detectors.

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* fast_dp and fast_rdp return with a non-zero exit code
when processing fails.

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* Catch case where diffraction strong to edge of detector.

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* Write out correct r_meas value in the fast_dp.json file.

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* fast_dp.json format has changed. Scaling statistics are now
stored in a structured dictionary.
(`28 <https://github.com/DiamondLightSource/fast_dp/pull/28>`_)

* removed XDS.INP templates; now calculated on demand using dxtbx
models from DIALS, thus allowing support for all beamlines
currently understood by DIALS

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* First release on PyPI.