Allow AI-document capture to scan an invoice / document as a whole

This would be useful as it will significantly reduce the number of transactions created from document capture. Currently, document capture posts each individual line of an invoice as its own transaction, which in turn results in multiple transactions per invoice. if document capture was to just post the whole invoice as a single transaction it would greatly reduce the amount of transactions. This in turn will make cross-referencing easier as well as remittances, additionally it would reduce the amount of data stored on sage as there would only be one transaction per invoice. With document capture currently working this way it would mean I would have around 100 transactions for only 10 invoices.