sfs_payment_comission_glp coorections and changes

[Ariel E. Figueroa - http://www.humanytek.com]

Hi Team, i need request some corrections & modifications in this development sfs_payment_comission_glp

Correction 1:
In my original request, the next points mention
6.1 Invoice 1 ammount = 1160 (including tax tax 16% of IVA mexican local tax) date invoice 01/01/2014 due date 01/30/2014.
6.4 The customer pay with an account.voucher 500 the day 02/11/2014 (12 days past of invoice due date).
Right now the "days due" are calculated taking the field date_invoice from account.invoice model, the correct way is calculate taking the field date_due from account.invoice

Correction 2:
Now the the payment day are taking from the value "creation document" this is wrong, the correct way must be take this value from the field "date" of the account.voucher (some times the payments are registered some days late but the payment was make "that" day entered by user).

Modifications:
1. menu item: Payment Commision Report, in spanish must be "Reporte de comisiones".
2. column name: Days due, in spanish must be "Dias de retraso".
3. Into the customer payments list view, add a new column "salesperson" ("Vendedor" in spanish) taking this data from salesperson field of the res.partner.

Thanks!

[Ariel E. Figueroa - http://www.humanytek.com (arielfigue)]

Done!