* Using lineitem estimated_unit_price to store the price instead of the lineitem...

* Using lineitem estimated_unit_price to store the price instead of the lineitem attrs
* If necessary, perform the currency conversion exactly once, when the order is activated.  Otherewise, assume the price is in the currency of the vendor.
* Create fund debits during PO activation instead of PO creation time.
* Cleared out a pile of deprecated code
* TODO: update JEDI template to pull price from the estimated_price_field

git-svn-id: svn://svn.open-ils.org/ILS/trunk@15769 dcc99617-32d9-48b4-a31d-7c20da2025e4