[IMP] sale: untaxed amount to invoice/invoiced on sale line

Similar fields were introduced at d2e33ba57c0517b88f3cdf987f6b161883b8272e
but their computation were not totally exact, so someone removed them.
Also, for performance sake, they were replaced by a (too) simpler
calculation at 39d0613187d36f16c541734e80925e9d.
Turns out, those fields were usefull !

Neither of those 2 implementations were 100% correct, so this commit
reintroduced thoses 2 fields on sale.order.line object:

1/ untaxed_amount_invoiced: will contain the amount (money without
taxes) invoiced
from the sale line, taking refund linked to the same SO line into
account. The formula is
   SUM(inv_line.price_subtotal) - SUM(ref_line.price_subtotal)
where
   `inv_line` is a customer invoice line linked to the SO line
   `ref_line` is a customer credit note (refund) line linked to the SO
line

2/ untaxed_amount_to_invoice: will contain the amount (taxes excluded)
of the money to invoice from this sale line. The formula is
   SOL.total - SOL.untaxed_amount_invoiced

Those numbers are interesting in reporting, and to manage the billing
part for salespersons.

Task #1857652

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