Add "Paid" Column to Sales Orders Table

To help quickly view the status of all orders, please consider adding a "Paid" column to the Sales Order table. Each order essentially has two paths of completion: fulfillment and payment. As it is now we have columns (Packed and Shipped) to represent the related statuses for Fulfillment, but only one column (Invoice) to represent the related statuses for Payment.

Doing so would better represent these two sales order completion paths:

Invoice > Paid

Packed > Shipped

And, in the same way that the Packed column status might only be half full to indicate a partially packed order, the Paid column status could provide a similar indicator for a partially paid invoice.

Perhaps we could even have an end-of-lifecycle status (in the main "Status" column) to indicate that an order has been both fulfilled and paid for, though I understand this is a more difficult UI consideration.

Thank you, and keep up the great work!