- multi-company record rules on contract line causes performance issue
- the label Partner (always False) don't make any sens
- When creating a contract from a sale order the company must be the sale order
company and not the user company
* Remove incorrect oldname attributes.
* Add filter on partners for running contracts (+ a support o2m field for that).
* Cover more tables in model renaming + cleaner code using a loop.
* Don't copy contract lines, but rename table + copy contract records on pre.
* Contract code is now populated to "Reference/Description" field in invoice.
* Order on new contract model has been restored to the same as old analytic accounts.
