[ADD] reimplement o2m's cancel-on-blur when no alteration has been done by the user to the row being edited (new or not)
[ADD] reimplement o2m's cancel-on-blur when no alteration has been done by the user to the row being edited (new or not)

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