Resolve "Harmonize column names in the overlay datasets"

Closes #596 (closed)

added 4 commits

• 374f6a98 - default column names are lower cased enum names
• c2e88a2f - identifier column name contains from 'identifier_' string and name of the enum field
• 2eee9b94 - function returns list instead of modifying parameter
• f068e309 - changelog updated

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unmarked as a Work In Progress

enabled an automatic merge when the pipeline for f068e309 succeeds

mentioned in commit a86c9f9f

merged