[FIX] handling of focus on m2o fields (in editable list row)

* Throw out focusin/focusout: the m2o widget's completion list is
  created at the page top (body) so the editable listview can't
  generically handle arbitrary widgets via mere focusin/focusout.

* Move responsibility of focus/blur events to the form view and its
  widgets.

* Events could not just be named ``focus`` and ``blur`` due to usage
  of jquery's event system: jquery will automatically call a method of
  the event's name if it exists on the object, which conflicts with
  .web.form.Field#focus and leads to an infinite loop (as Field#focus
  focuses the field's root element, which triggers the focus event,
  which calls the focus method,...) => form-* and widget-*, can be
  switched back in trunk

* m2o mess kind-of complex, basically:

  - the core input and the menu button behave as blur/focus triggers

  - when the autocompletion list is clicked, it will temporarily
    remove the focus from the input (blurring it), and put it back
    later... on a timer. Issue is the timer, we don't want to rely on
    having a bigger timer (as later revisions of the library may
    change our timings and it's iffy to rely on timers conserving
    order perfectly); on the other hand we know the focus *will* come
    back to the input eventually. So we can just avoid propagating
    blur iif the blur is the consequence of having clicked on the
    completion list.

  - roughly the same thing happens when clicking on $drop_down (after
    fixing the handling of its final focus to be consistent, as
    $drop_down would not re-focus the input if it was *closing* the
    completion list)

  - pretty sure the menu thing does *not work at all*, but I don't
    have the courage of fixing it before committing this part.

Date/datetime widget remains to be handled, basically the core focus
handling is the same as in e.g. a charfield *but* needs to handle (and
ignore) loss of focus from clicking inside the picker
widget. Expecting the level of suck to reach unknown heights.

bzr revid: xmo@openerp.com-20120619072518-lsrhzij5asxt2aea

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