All Primary datasets

incl. the changes discussed today, fake DOIs from Tom's file, only missing 2 descriptions. Descriptions and other examples will follow tomorrow morning
Do we need `980 $a RESEARCH`?  I'm asking because `980` is usually mapped to `/collection/...` and we don't have "Research" collection yet.

I think that an extra mapping to Research may not be needed here, if we know that basically "primary dataset ->  research".  

BTW if we do introduce more collection mappings in `980`, then we should have (single) primary collection stored in `980 $a` and (multiple) secondary collections stored in `980 $b`.