Bug 19097: Remove wantarray from GetMarcFromKohaField

Bug 19097: Remove wantarray from GetMarcFromKohaField

The routine should be called in list context now.
Warns also about use of obsoleted framework parameter. This
is the case for several years already btw. But may help us
catch a forgotten occurrence? Can be removed later.

In a follow-up we will check for second parameters and
we will update calls in scalar context.

Test plan:
Prove t/db_dependent/Biblio.t

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>