Stored procedure helpers. Order repo and model. More SQLService updates.

* A generic stored procedure helper added, and support for calling them.
* Order and OrderItem tables added, including helpers and calls to SP for creation and updates.
* Minor updates to other repositories.

pyjeeves/repositories/pricelist.py

@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 
 from pyjeeves.models.raw import PriceList as PriceListModel
+from pyjeeves.models import db
 from sqlalchemy.orm.exc import NoResultFound
 
 from pyjeeves import logging
@@ -15,7 +16,7 @@ class PriceList():
     def get(price_list_no):
         """ Query a price list by number """
         try:
-            return PriceListModel.query.filter_by(
+            return db.raw.query(PriceListModel).filter_by(
                 PrisLista=price_list_no
             ).one()
         except NoResultFound: