[FIX] Replaced return by raise, in this way the error message is correctly shown
[FIX] Replaced group.name by group.field_id.name
[FIX] Replaced warning by raise
[FIX] message error
[IMP] Renamed inherited view and simplified a bit the xpath expressions
[FIX] I aalso added the properties to the context which is passed to product_uom_change using the trick provided by the web_context_tunnel module
Merge pull request #2 from tafaRU/fix_sale_properties_dynamic_fields

[FIX] sale_properties_dynamic_fields and sale_line_price_properties_based