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Store one "changed" flag per client; this allows to correctly detect which client needs to be run when a parameter is changed.

Warning: this changes the onelab protocol: now at version 1.1 -- you'll need to upgrade all your clients.

fine-tune setChanged (the real fix will be to store the _changed attribute for each client in the parameter's _clients map)

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Major work on GUI : removed much-hated "menu window" & merged onelab tree in graphic window. Gmsh now requires FLTK 1.3.

(Additional changes: fixed crash when de-minimizing opengl window on mac os ; refactored Msg::StatusBar)

- fix loop index (off by one)
- reset options in menu everytime we rebuild the menu

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