[IMP] change module functionality ...

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

Hi team, please make the next changes on the module sfs_account_sale_margin:

1. remain the initial date and final date fields, based on the selection user the view must show the result based only in the account.invoice.line.

2. In the wizard add a new field many2many relation to account.journal model to the user can select each journal to generate the view.

3. in the wizard also add another new field many2many relation to product.product model, to the user can select wich products must be NOT considered in the result view.

Thanks!

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

Done!