Replace protection_class by documented protect_class tag or removed where not applicable

Replace protection_class by documented protect_class tag

Remove various forms of protect_class tags with values meaning that there is no value

Remove protect_class=n.a.

Remove or fix protect_class tags based on some research

Remove protect_class tag. This isn't a nature reserve

Use much more popular and documented iucn_level tag instead of ref:IUCN and fix iucn value based on some research

Use much more popular and documented iucn_level tag instead of ref:IUCN

Remove tags with value "n.a." from nature reserves, OSM uses missing tag to denote a value that's not set

Remove tags with value "n.a." from nature reserves, OSM uses missing tag to denote a value that's not set

Remove tags with value "n.a." from nature reserves, OSM uses missing tag to denote a value that's not set

Use much more popular and documented iucn_level tag instead of lst:IUCNKAT

Use much more popular and documented iucn_level tag instead of lst:IUCNKAT

Use much more popular and documented iucn_level tag instead of ref:IUCN

Use much more popular and documented iucn_level tag instead of ref:IUCN

Use much more popular and documented iucn_level tag instead of ref:IUCN

Remove tags with value "n.a." from nature reserves, OSM uses missing tag to denote a value that's not set

Remove unusual and confusing ref:IUCN_level tag, use iucn_level instead

Remove unusual and confusing IUCN tag, iucn_level is already tagged correctly

Fix type tag on boundary relations