[ADD] deffered onchanges part1
[ADD] deffered onchanges part1

--HG--
extra : convert_revision : fme%40openerp.com-20110407155936-5vh73opvzdfrn2ww


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