Verify new taxa

[peterdesmet]

415 taxa are currently not verified. 421 are from the new run on 2023-09-15 (which includes the waarnemingen.be checklist). We should make an effort and verifying the suggested synonymy where we can. See spreadsheet.

• Previously listed synonyms for which the scientific name was updated in the backbone ok
• Previously listed synonyms for which the accepted scientific name was updated in the backbone ok