Improved the search/replace dialog box:
Improved the search/replace dialog box:

+-----------------------------------+
| Find: ************** [Find again] |
| Replace With: ****** [Repl.&Find] |
| [?] Search backward  [   Close  ] |
+-----------------------------------+

Ctrl+b  (un)checks "Search backward",
Return  searches again,
Ctrl+r  replaces and searches again,
Esc     close the dialog box.

Patch by Cedric Auger.

git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@13713 85f007b7-540e-0410-9357-904b9bb8a0f7

maximedenes/native-coq,maximedenes/native-coq,maximedenes/native-coq