Comment 6 for bug 1333254

Code, Perl live test, and release notes pushed:

http://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/berick/lp1333254-invoices-paid-on-close

This code includes code from bug #1380709 -- I'll rebase to master and remove these commits once said branch is merged (or we they could be merged all together).

From the commit:

    To test:

    1. Activate a purchase order with at least one lineitem/copy.
    2. Create an invoice for the PO.
    3. Confirm PO shows same amount encumbered as before invoicing and $0
       paid.
    4. Close the invoice.
    5. Confirm amount encumbered on the PO is reduced by the amount invoiced
       and the amount paid on the PO is increased by the amount invoiced.