[IMP] Use parent and remove session from ganttview.
[IMP] Use parent and remove session from ganttview.

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