Belated backport of r18688 from trunk

Belated backport of r18688 from trunk

Booking: fix bug reported by Robert Soulliere wherein the items associated
with picked-up reservations didn't actually get their status set to 'checked
out' like they should have.

Robert reported this bug on Launchpad (#672748) and provided a patch, but
there were some neighboring bugs in the circulation logic anyway, so they've
all been fixed together.

Update: Robert and I aren't yet actually certain whether this fixed the problem
when using legacy circ scripts.  Investigation continues on Launchpad.

git-svn-id: svn://svn.open-ils.org/ILS/branches/rel_1_6_1@18904 dcc99617-32d9-48b4-a31d-7c20da2025e4