make in_kbart transform inclusive of last year

Frequently when looking at preservation coverage of journals, the
current year shows as "un-preserved" when in fact there is robust KBART
(keepers, eg CLOCKSS/Portico) coverage. This is partially because we
don't update containers with KBART year spans very frequently (which is
on us), and partially because KBART reports are often a bit out of day
(eg, doesn't show coverage for the current year. For that matter, they
probably take a few months to update the previous year as well, but that
is a larger time span to fudge over.

This patch means we will count Portico/LOCKSS/etc coverage for "last
year" to count as coverage of publications dated "this year". Note that
for this to be effective/correct, it is assumed that we will update
containers with coverage year spans at least once a year, and that we
will re-index all releases at least once a year.

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