[IMP] procurement: removed the schedule_range field on res.company which was...

[IMP] procurement: removed the schedule_range field on res.company which was error prone and not really usefull + made the scheduler run in SUPERUSER to avoid intercompany and access rights issues + made the run of procurement as SUPERUSER too for the same reasons

bzr revid: qdp-launchpad@openerp.com-20140403071010-5mrox75rkufur2nw