[FIX] FormRenderingEngine: allow class propagation to group cells
[FIX] FormRenderingEngine: allow class propagation to group cells


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