Acq: If deleting line items with copies, remove fund debits and maybe copies

Acq: If deleting line items with copies, remove fund debits and maybe copies

Depending on workflow, there are times when users might delete Acq line
items that have fund debits and/or real catalog copies attached to them.

We should always delete such fund debits when deleting line items (since
those debits otherwise become invisible and just throw off fund
balances), and we should also delete copies *iff* the staff user
confirms that's what they mean to do, and they have the DELETE_COPY
permission, of course.

This should resolve https://bugs.launchpad.net/evergreen/+bug/1175740

Signed-off-by: Lebbeous Fogle-Weekley <lebbeous@esilibrary.com>