Kiipu: void a draft, report a payment

kiipu.draft_voided voids a draft invoice (never an issued one). kiipu.payment_reported leaves a payment notice in the approval queue; a person applies it.

Actions this change touches

• kiipu.draft_voidedVoids a DRAFT invoice (one created with kiipu.invoice_proposed and not yet issued), by its id or by the client's name when it is their only draft. Does not void issued invoices: that is for a person in Kiipu.v1
• kiipu.payment_reportedLeaves in the Kiipu approval queue the notice that a client (by name) paid a given amount of an open invoice. Does NOT apply the payment and touches no balances: a person checks it against the bank and applies it. If the client has several open invoices the number must be given.v1