[IMP] use registry for widgets
[IMP] use registry for widgets

Re-introduced 'char' fallback, but other sections (form and search) log an error and proceed blissfully unaware, I should probably do that here

--HG--
extra : convert_revision : xmo%40openerp.com-20110331124127-l8f3w8sp7egeboxb


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