This module adds a new button 'Check Supplier Info' in supplier invoice
form.

![image](../static/description/supplier_invoice_form.png)

When the user clicks on it, they can see the changes that will apply to
the vendor information. Optionally, they can remove some temporary
changes, specially, if, for example, a vendor applied an exceptional
price change.

![image](../static/description/main_screenshot.png)

- blue: Creates a full new supplier info line
- brown: Updates current settings, displaying price variation (%)

This module adds an extra boolean field 'Supplier Informations Checked'
in the 'Other Info' tab inside the supplier invoice form. This field
indicates that the prices have been checked and supplierinfo updated (or
eventually that the changes have been ignored).

![image](../static/description/supplier_invoice_form_other_info_tab.png)
