wg_Command: detachable, less "from the 80s", query pane

- Tabs have labels derived from the query (e.g. "About eq_ind" will have
  "eq_ind" as its label, that is better than "Page 1" ;-)
- Tabs have a [x] close icon
- Icon to create a new tab in in the notebook
- Dispotically grab the F1 key to open/close the query pane
  (alt-esc is grabbed by windows managers these days)
- Esc hides the query pane (like the search pane)
- F1 puts a detached query pane in front
- Tab switches from the combo-box to the entry on its right
- Detaching is taken-over, and the query pane is reparented in a regular
  window that can be resized
- A detached query pane can be put back by closing the window

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16817 85f007b7-540e-0410-9357-904b9bb8a0f7

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