[IMP] add a class to factorize view manager layout
[IMP] add a class to factorize view manager layout

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