compounds, transfinite, etc. easier

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

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recoded way to create boundary layers using explicit extrusion directions from vector post-processing view

Mesh.RemeshParametrization=1; //(0) harmonic (1) conformal 
Mesh.RemeshAlgorithm=1; //(0) nosplit (1) automatic (2) split metis
!!! This replaces old parser stuff such as Compound Surface()={} Harmonic_NoSplit;
!!! Default values are harmonic and automatic
TODO: change this in FLTK/optionWindow.cpp

- boundary of combined entities in parser

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- new GetEnv and GetString functions

2d meshing algo with -optimize does lloyd optim (tri or quad optim algo depending if recombine is selected)

* issue error for zero volume elements in FEA export
* reset element number between 2D/3D in FEA export

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rewrote Compound interface in terms of standard elementary entities

Warning: this is work in progress and *will* break some existing examples (negative numbers etc.)

Added possibility to save distance to all boundaries (gmsh box.geo -2 -distance writes an additional distance.pos file)
distance is computed simply with ann for the moment

new "Delete Options;" command to reset all options to their default values

- invert #define logic (HAVE_MESH, HAVE_POST, HAVE_SOLVER, ... instead of HAVE_NO_MESH,
  HAVE_NO_POST, HAVE_NO_SOLVER)