stock.move.group renamed to procurement.group

stock.move.group renamed to procurement.group
procurement module (where stock.move.group was defined) does not depend on the stock module
the same grouping system could be used for services too

procurement.group
removed sequence_id field
put a default values on the name field, using a defined sequence
renamed "Move Group" into "Procurement Requisition"

procurement object:
location_id should not come from the customer property but should be stored on the procurement (set by the sale order, using the customer property)

bzr revid: fp@tinyerp.com-20130629091328-5gc39647aa2pymlf