IBPT: Use imported value if product is not configured.

If the product origin is not properly configured, consider it a imported
product for the fiscal coupon tax messages

Change-Id: I7d45a68a53dca9e14a713045383800036ecf791d
Update price correctly in sale quote wizard.

Probably due to some change in kiwi, the price was not being updated
correctly, when we had a client category selected and a sellable with a
special price for that category.

Change-Id: I7421a643d62816cdb14adeafe3b00a86879a515b
Fix unused parameter removing.

The prevous code was using tring to use the value instead of the actual id
to fetch the object for removing.

This is fixing that by using the field_name instead

Change-Id: Ib6e4a4b1e4e5b593c7b56331199cc59f77d71a91