Redefine cell measurement wavelength as measurand #496
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This PR redefines the
_cell_measurement.wavelength
data item as a measurand and adds the corresponding SU item. While this data item is already deprecated, it makes sense to still correct this issue for consistency (_cell_measurement.temperature
,_cell_measurement.pressure
and the_diffrn_radiation_wavelength.value
data item that superseded_cell_measurement.wavelength
all allows SU values).Note, that the definition of this data item in the DDL1 dictionary also did not allow SU value, but I have opened a separate PR in the DDL1 legacy dictionary repository to fix this (COMCIFS/DDL1-legacy-dictionaries#9) that can be merged once/if this PR is approved.