SIP RenewAll

Adds SIP plugin support for SIP message types 65/66 (Renew All).  When
requested, the plugin performs a renewal on all items currently checked
out for the user.

Signed-off-by: Bill Erickson <berick@esilibrary.com>
Signed-off-by: Mike Rylander <mrylander@gmail.com>
SIP renew-all; reset renewal statuses

Reset the list of renewed and unrenewed items for each instance of the
RenewAll transactions.  Otherwise, items from previous transactions will
bleed into the current transaction.

While we're in there, fix a couple of tabs.

Signed-off-by: Bill Erickson <berick@esilibrary.com>
Signed-off-by: Mike Rylander <mrylander@gmail.com>