Coded Value Maps Opac Visible/Search Labels

Coded Value Maps Opac Visible/Search Labels

Add two new fields to Coded Value Maps:

1 - Opac Visible, for "does this show up in opac limiter boxes"
2 - Search Label, for "what does this get called for those boxes"

Intended use cases include:

Re-labeling MARC fields without changing the base MARC information, say
because you don't expect patrons to understand "Projected Medium".

Hiding things that don't apply, say the vast majority of language limiters,
without needing to delete rows.

I also hooked it up in JSPac, because it was easy to do so.

Signed-off-by: Thomas Berezansky <tsbere@mvlc.org>