Bug 3007: Remove unimarc_field_700-4.pl value builder

Bug 3007: Remove unimarc_field_700-4.pl value builder

I tried translating it, found it not working and replaced
by the qualif authorised value list with relator terms/codes.

To test:
* Make sure the unimarc_field_700-4.pl is no longer listed in
  frameworks.
* Make sure it's not used in the standard frameworks.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>