Expand occurrence download fields

[mikkohei13]

As data user I want that important data are available as dedicated fields, so that I don't need to calculate them myself (for potentially millions of rows.)

• document datetime begin and date end (not available currently, overridden by unit datetime)
• species scientific name
• species MX code
• 1km ykj cell
• Moving status: https://schema.laji.fi/property/MY.movingStatus (note: multi-select field)