Publish iic.pfsConfig keyword fields to FITS cards

Now that the pfsConfig info is always generated by the iic actor, we can switch to directly using the iic.pfsConfig keyword designId,designName,ra,dec,pa,design0,variant fields to populate the field/design FITS cards. Most of these cards do not yet exist.

We already have the beloved W_PFDSGN. I had misunderstood the meaning of the RA_CMD gen2 status, and now understand that we still need to add field/design center cards. Given the 6 letter limit, I'd like to add the geometry cards using a different format:

W_DSNRA
W_DSNDEC
W_DSNPA
W_DSNNAM

but to base the variant info on the `W_PFDSGN` key:

W_PFDSN0
W_PFDSNV

Complain quickly, please. And please not W_PFDSN[0VRDPN]