[FIX] gantt so it goes through DataSetSearch instead of calling search_read directly
[FIX] gantt so it goes through DataSetSearch instead of calling search_read directly

havt/openerp-web,akretion/openerp-web,havt/openerp-web,akretion/openerp-web,havt/openerp-web,havt/openerp-web,akretion/openerp-web,havt/openerp-web