[FIX] reimplement [Edit] button on images

Button implementation turned out to be crap:

* Didn't work at all in Firefox (!)

* Unreliable in webkit, some types of image selection wouldn't
  correctly activate the button

->

* changed RTEImageDialog to take an (optional) image element, used as
  the "source element" if provided. This allows greater reliability
  for events which may leave selection in debatable or variable
  (across browsers) state

* setup and teardown button on hover, using selection triggered issues
  with oe_overlay thing where e.g. the first click on the button would
  work but the second one would not (it'd be intercepted by the
  overlay as far as I can tell).

  This also saves a click for user, they will see the [Edit] button
  immediately when putting the cursor over the image.

bzr revid: xmo@openerp.com-20131121110748-s5e2ne3etpzwi2a6

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