Document delivery by email is now reliable

Sending a quote, invoice or delivery note manually now always sends a notification email to the customer. The "attach PDF" setting only controls whether the document is attached.

Until now, a quote, invoice or delivery note could be marked as "sent" without the customer actually receiving an email — depending on whether "Attach PDF" was switched on in settings. That's fixed now: sending a document manually always sends a notification email to the customer. The "Attach PDF" setting only controls whether the PDF file is attached directly to that email.