Move field bank_account_required from module account_payment_partner to account_payment_mode

Make the mandate a required field on payment line when the payment method has mandate_required=True
Make the bank account a required field on payment line when the payment method has bank_account_required=True
Minor code cleanup
PEP8

account_payment_mode/models/account_payment_method.py

@@ -15,7 +15,10 @@ class AccountPaymentMethod(models.Model):
         "this payment method. Therefore, if you change it, "
         "the generation of the payment file may fail.")
     active = fields.Boolean(string='Active', default=True)
-    # In the pain_base module, we will add a default_pain_version
+    bank_account_required = fields.Boolean(
+        string='Bank Account Required',
+        help="Activate this option if this payment method requires you to "
+        "know the bank account number of your customer or supplier.")
     display_name = fields.Char(
         compute='compute_display_name',
         store=True, string='Display Name')

account_payment_mode/views/account_payment_method.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<openerp>
+<odoo>
 <data>
 
 <!-- The object account.payment.method is defined in the account module
@@ -14,6 +14,7 @@ here. I hate the objects that don't have a view... -->
                 <field name="name"/>
                 <field name="code"/>
                 <field name="payment_type"/>
+                <field name="bank_account_required"/>
                 <field name="active"/>
             </group>
         </form>
@@ -59,4 +60,4 @@ here. I hate the objects that don't have a view... -->
             sequence="30" />
 
 </data>
-</openerp>
+</odoo>