[FIX] focusing of form fields, implementation of focusing for tag m2m

[FIX] focusing of form fields, implementation of focusing for tag m2m

jQuery's *focus* method must *not* be used: it triggers the blur and
focus events in the wrong order (and potentially more than once),
breaking the focus handling of the o2m editable list and making it
essentially unusable.

The DOM method behaves correctly, triggers the blur first and the
focus second in a different runloop frame (thus it's possible to bind
on blur, wait a set time and execute the actual blurring iif no focus
event has been seen within the form).

bzr revid: xmo@openerp.com-20121211145652-y63a0ny0gmoiozhn