[FIX] contract: Currency is not editable + pricelist from partner

Previous related field was not accurated nor editable. Now the field is got
properly from a computed field.

Reviewing this, as the currency was taken (and it continues being taken) from the partner
pricelist if no pricelist is explicitly set, automatic price should use the same logic for
using partner pricelist.

Also remove roadmap as already attended

contract/__manifest__.py

@@ -9,7 +9,7 @@
 
 {
     'name': 'Recurring - Contracts Management',
-    'version': '12.0.7.2.0',
+    'version': '12.0.7.2.1',
     'category': 'Contract Management',
     'license': 'AGPL-3',
     'author': "OpenERP SA, "