Bug 15870: MARC Filter to exclude fields/subfields lacking visibility

 Bug 15870: MARC Filter to exclude fields/subfields lacking visibility

TEST PLAN
---------
0) Apply 15777 and 15871 as required.
1) Apply patch
2) prove -v t/db_dependpent/RecordProcessor_ViewPolicy.t
   -- all should pass.
3) koha qa test tools.
BONUS
4) perlcritic -1 t/db_dependpent/RecordProcessor_ViewPolicy.t
   -- using the koha qa test tools perlcriticrc, it should pass
      though I am excluding checking print return values.
      (see bug 15646)

Signed-off-by: Hector Castro <hector.hecaxmmx@gmail.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>