Taxonomy update with de-duplicated Timeseries cross-referencing, plus timeseries URI added to timeseried data.json.
New timeseries, presumably from the updated spreadsheet.
Added timeseries URI to timeseries data.json so that timeseries can be cross-referenced from different nodes in the taxonomy.
Merge branch 'taxonomy_sections' of github.com:ONSdigital/tredegar into taxonomy_sections