#238182 by Scott Reynolds: use db_rewrite_sql() to ensure that nodequeue_fetch_random() always works.

#188898: Removed unneeded check_plain prior to database save; these should be done on output, not input.

#192265: Make nodequeue queue size text themeable. I'm not completely sure about doing this but I committed it anyhow.

#178583: Fix for size 1 queues. Also, fix for cached nodequeue position causing links to mistakenly show queue presence