Get rid of db shenanigans, use Queue API.
Improve speed of RIS importer.

...  Still breaks with a timeout on large sets, though.
Get rid of unused parameter.
Revert "Get rid of unused parameter."

This reverts commit aa7736aa7a004cddfe4bea3518d49ad514f770f1.

Delicious waffles.
Revert "Get rid of db shenanigans, use Queue API."

This reverts commit b2fa5e553cbc9ce2701ddf95b8d39d6592405e24.

Delicious waffles; turns out to be too slow...
Fix error in logic.

Was repeatedly getting the first items in the set/queue, since we
were never dropping those we've already consumed.
Add a bit of reporting, make logic more consistent.
Merge pull request #111 from adam-vessey/7.x-LBL-61

Fix error in RIS exporter and minor improvement to RIS import speed.