Scope: write:maintenance

Replaces the job's invoice details and, unless markReceived is false, marks the invoice
received. Follows Loop's rules: only on a complete job with an instructed quote; not once
the job is linked to a charge in Loop (409); invoiceDate can't be in the future and is
required to mark it received. VAT is worked out for the invoice date. The agency fee stays
as it was instructed, and marking the invoice paid stays in Loop.