Fast-dp

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* fast_dp no longer supports Python 2.7 or 3.5
* change default plugin for Eiger data to durin-plugin.so

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* bugfix for Python 3 error

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* add license file to release

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* fast_dp is no longer supported with DIALS 1.12 and older versions
* add support for DIALS 2.1+
* add support for Python 3.8

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* add support for DIALS 2.0
* use correct number of cores for integration with forkxds

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* Improved support for spacegroup names.
(`41 <https://github.com/DiamondLightSource/fast_dp/pull/41>`_)