kohabug 2219 Corrects inconsistent use of subscription.serialsadditems column

kohabug 2219 Corrects inconsistent use of subscription.serialsadditems column

From the bug report:

The serialsadditems syspref was ostensibly removed in DB rev 071
(http://git.koha.org/cgi-bin/gitweb.cgi?p=Koha;a=commit;h=5c41ae54e68866f9661e853376537059f4d83f70)
in favor of a new serialsadditems column in the subscription table.

However, this removal was incomplete.  It is still created for new installations by:

installer/data/mysql/en/mandatory/sysprefs.sql
installer/data/mysql/fr-FR/1-Obligatoire/unimarc_standard_systemprefs.sql

and is used in

serials/serials-recieve.pl
serials/serials-edit.pl
admin/systempreferences.pl

Since the system preference was not removed from the sample data scripts, it
is necessary to add another DB rev to remove it - a user may have made a
fresh install of Koha after DB rev 071.

Signed-off-by: Galen Charlton <galen.charlton@liblime.com>
Signed-off-by: Joshua Ferraro <jmf@liblime.com>