* IDEMPIERE-4490 Set default Contact/User in SO, Invoice, M_InOut
* Ran modelgenerator again with the new field = null
* IDEMPIERE 4490 - Update the migration scripts to 7.1 and set Bill_User_ID to null
* IDEMPIERE 4490 - Update the migration scripts to 7.1
* Change field name from Invoice Address to Invoice Contact / Ship Address to Ship Contact
* IDEMPIERE-4490 Add logic to CalloutOrder.bpartnerBill
Diego Ruiz