Bug 14245: Problems with RIS export in unimarc

Bug 14245: Problems with RIS export in unimarc

Variable $itype is used an all C4/Ris.pm to switch
between marc falvors, but is local and not passed along
as argument.

As a quick solution, is defined as global

To test:
1) On UNIMARC setup, export a record as RIS,
check that author (and other fields) are displayed
incorrectly

2) Apply the patch

3) Export again, improved results

4) Run t/Ris.t

There are other problems in this script, needs maintenance
(e.g. no Modern::Perl friendly)

Signed-off-by: Victor do Rosário <jvr@fct.unl.pt>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@unc.edu.ar>