lp1208875 make _get_circ_history_csv work with fetch_user_circ_history

lp1208875 make _get_circ_history_csv work with fetch_user_circ_history

braindead adaptation.. _get_circ_history_csv predates fetch_usre_circ_history

I haven't scrutinized what the two circ_history subs actually do, but I bet
there's room for improvement here.

However, as it is now we do get a significant speed boost.  Thanks Dyrcona!

Signed-off-by: Jason Etheridge <jason@equinoxinitiative.org>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>
Signed-off-by: Jason Stephenson <jason@sigio.com>