LP 1170794: Skip Deposit Fee on Renewal

LP 1170794: Skip Deposit Fee on Renewal

Skip charging the deposit fee if the circulation is a renewal.

This commit sets the Circulator object's skip_deposit_fee to true in
mk_env if the current action is renew.  This causes the deposit fee to
not be charged.

It also adds a check to the Circulator object's check_item_deposits
method so that the ITEM_DEPOSIT_REQUIRED event is not thrown if
skip_deposit_fee is true.  Something similar should be done for the
ITEM_RENTAL_FEE_REQUIRED event, but that is beyond the scope of this
bug.

We also add a rudimentary, but hopefully sufficient, release note.

Signed-off-by: Jason Stephenson <jason@sigio.com>