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Revise dataset structure and content

Ethan Welty requested to merge v4-beta into main

Closes several open issues:

  • #10 (closed) by updating references with canonical URLs
  • #15 (closed) by renaming tables to 'glaciers', 'bands', and 'points', using consistent id field names (e.g. band.glacier_id -> glacier.id), and removing fields replicated across tables
  • #16 (closed) by renaming maximum_thickness to max_thickness
  • #17 (closed) by dropping the country column
  • #24 (closed) by adding a fourth survey table, making it possible to add point-only data with no records in glacier
  • #26 (closed) by adding the submission to a child directory in the new submissions/ directory

And introduces many other changes, including:

  • Replacing cryptic codes with more human-readable codes
  • Using lowercase field names
  • Using full, unicode glacier names
  • Add popular but missing glacier database and interpolation codes
  • Split survey_method into method and platform
  • Split fuzzy date fields into date ranges using two date fields using ISO 8601 format (yyyy-mm-dd)

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