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Before this change, users which had reached max allowed number of loans
($needsconfirmation->{TOO_MANY}) would be allowed to checkout
items which where allready checked out to another.

DEICH-5652 deichman.no: use switch case with exact match for checking reserve errors instead of includes

Unfortunately, we haven't completed the transition to using
item location lives|goes|co, but still is left with a mix of
old logic (read: branchtransfers) and partly implemented location
logic.

This change makes checkin consider the branch of c/o location if present,
and complete branchtransfer if the branch is the same as the branch
where the checkin is performed, disregarding the branchtransfer.tobranch.