Reorganized computation and usage of scaled Jacobian in OptHOM, fixed bugs. Removed specific distortion/scaled Jacobian computation routines. 

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Optimized generic computation of scaled Jacobian range in MElement. Adapted AnalyseCurvedMesh plugin as well as generic distoShapeMeasure to use it. 

Re-organized and cleaned up nodalBasis/polynomialBasis/JacobianBasis. Enabled higher-order bases for prisms. Fixed and completed shape functions and Jacobian for pyramids. Fixed bug in computation of Bezier exponents for hexahedra. TODO: OptHOM bug with pyramids to be fixed, clean-up of bases (point generation) to be completed.

- getfunctionspaces now returns a nodalBasis instead of polynomialBasis
- reversed order for saving elements in GModelIO_MSH - makes things simpler for subelements
- taking msh file version into account while exporting data files (PView ...)

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)

Implementation of high order pyramids. Introduces nodalBasis as a parent class of polynomialBasis and pyramidalBasis.