[FIX] kanban: avoid wrong placement of button on ie9

On ie9, the 'read more' button in kanban view was placed in the middle of the window instead of the bottom
[FIX] point_of_sale: correct call to default value

The default value should be called with a lambda otherwise the payment_date is set to the date the server was started (opw 606715)
 Merge branch '7.0' of https://github.com/odoo/odoo into 7.0-win32