Relator table out of date

The list of codes for relators distributed with the program is somewhat out of date with the one on the LC site. (JD)

The following changes are needed to be in sync with LC:

Codes to be added:

cov   Cover designer
mrk   Markup editor
own   Owner
prm   Printmaker
wit   Witness

Codes to be removed:

acp   Art copyist
mcp   Music copyist

Status: Fixed in 232