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Allow multiple wavelengths in a single radiation source #18

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This is an experimental PR to show how multiple wavelengths (e.g. K alpha1, K alpha 2 or harmonics) can be associated with a single diffraction experiment (_diffrn.id). This is not currently possible in a multi-experiment CIF. This PR accomplishes that by adding a link to _diffrn.id to the DIFFRN_RADIATION_WAVELENGTH category. _diffrn_radiation.wavelength_id would also be deprecated in the core dictionary (not included here). Where information from a single _diffrn.id is in a single data block, _diffrn_radiation_wavelength.diffrn_id need not be supplied.

See also alternative PR accomplishing the same by splitting radiation definition out of DIFFRN category.

…length

This makes it possible to associate a collection of wavelengths
with a diffraction experiment.
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