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Add gamepad use to navigate into the model. Compiles on MS-Windows but still not works (to be done).

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)

Renamed compound_only parameter to showCompound. Enable to fix issue with invisible discrete meshes.

Some steps to a better usability with compounds. Improvements in drawing of compounds: Edges of compounded surfaces in the CAD are hidden, only the collection of compounded surfaces is shown, the single surfaces are hidden. The draw command is called for the compound and then piped to the underlying surfaces. Can be controled with commandline parameter 'compound_only'. Further steps will follow in near future (high order meshes using compounds etc.).

rewrite the option database :-))

- fixed MED node ordering
- polished 64 bit Cocoa Mac OS X FLTK version
- updated copyright

- new GetEnv and GetString functions

optimizing 3D meshes without also optimizing 2D meshes with Lloyd

introduced mesh.optimizeLloyd to fix this

 bar: it's not dynamic in fltk 1.1)

stuff, like plugin drawing

re-committing work from last two days after server crash:

- refactored old Geo code (new/delete)
- moved DrawPlugin to Plugin
- move from matheval to mathex
- move from Flu_Tree_Browser to Fl_Tree
- fixed crash in Triangulate plugin

multi-window & multi-coordinate system drawing.

There's no new functionality for now: PLEASE TEST THAT EVERYTHING
WORKS AS IT USED TO BEFORE.

untabify

start reducing header pollution (removed Gmsh.h + cleaned up GModel & co)