10 Feb 2024 - Added Purchase Order

1. Added customer_id as foreign key into purchases table.
2. The idea - "Customer" is the "company" itself. "Deliver To" can be any person/department/branch within the company.
3. QR and delivery order report - Print on page load.
4. Added purchase order and purchase order items tables.
5. Added PURCHASE_STAT setting.
6. Added company name, address, telephone, email settings.
7. Include company info in DO & PO.
8. PAGE-settings.php - Company address will be the odd textarea.
9. Some general code cleanup for delivery order.
10. Updated autocomplete - Added purchase supplier suggestion and fixed supplier item to also include supplier id.