[IMP] module loading and tests profiling

Add a loglevel 25 to log some INFO to runbot
Add timers for loading and testing
Silence empty test suite
ir_logging use relative pathname, warning this doesnt work for --addons-path modules yet.
[IMP] test impprove HTTPCase opener

Simplify website crawler using the generic HTTPCase opener
[IMP] website crawler log show query/s
[REM] useless icon send a message

The action is available from the wall.
[IMP] automatic fiscal positions for simple cases

Add group of countries res.country.group
Add get_fiscal_position method a method to compute a fiscal position based on company_id, partner_id, delivery_id
The meaning of res.partner.fiscal_position is now a forced a fiscal position.
The default implementation should handle simple cases, like VAT in UE and sales
tax in the US, but the method can be overriden to handle more complex ficals
rules.
[FIX] purchase_requisition test of PO's
[IMP]: rename all decimal precision account to amount, Product Price ==> Price, Product Unit of Measure ==> Quantity, Product UOS ==> Quantity, Stock Weight ==> Weight and Create a new Data File in decimal_precision module and Improvement in Decimal Precision.