Breaking change: format = "wide" is no longer supported for so_isotopes
Linked to the 2021-07-05 version of the dataset (https://doi.org/10.5281/zenodo.5072528)
Added a NEWS.md file to track changes to the package.
The format parameter was introduced to the so_isotopes function. The current default format is "wide", in which case the data will be formatted with one row per record and multiple measurements (of different isotopes) per row. If format is "mv", the data will be in measurement-value (long) format with multiple rows per original record, split so that each different isotope measurement appears in its own row. Note that "mv" will become the default (and possibly only) option in a later release. Currently, record_id values in measurement-value format are not unique (they follow the record_id values from the wide format). The record_id values in measurement-value format are likely to change in a future release.