getlibstatut added

Add function getlibstatut and libstatut on task (fk_statut allready present on project_task table)

Corrected English typo

sender.

FIX #1460, #1461

Fix database prefix usage

- Add missing triggers in interface_90

FIX #1485:LINEBILL_SUPPLIER_DELETE failure trigger leads to an endless 

disabled.
Fix: Option STOCK_SUPPORTS_SERVICES was not correctly implemented
(missing test at some places).

is a validation error

Fix == instaed of = in variable affectation

margin.

supplier order.

Fix 1455 outstanding amount