orientation bug in extrusion

- make it easier to build universal binaries on Mac
- remove unused arg in transform functions (an prepare the terrain for periodic meshes)

- added warning dialog before attempting to append a scripting
command to a non-geometry file

- fixed mean plane computation for periodic curves

- added headers + ramn indent on Attractor files

enhancement of gmsh Surfaces

JFR

fix shift/reduce conflict in parser (had to slightly modify embedding syntax)

make depend

corrected some bugs in 2d mesher & occ interface

added MED export capability (merci Pascale!!)

- using quads to draw 2nd order elements was a bad idea (they can be
non-plane, so the normals computed for lighting did not always look
nice). It's better to just split each quad into 2 triangles.

- import THEM in ParseString

- save physicals labels when saving unrolled geometries
- fixed crash in unrolled geo save (discrete points)
- Delete Physicals now also deletes the physicals in GModel
- removed unused rules and terminals in parser
- put at least one mid-point when meshing non-straight lines
  in OCC: this fixes most of the trivial 2d meshing problems

removed gobal meshSize in GMODEL: for now use CTX.lc, which is correctly
updated when multiple files are merged

- new option Geometry.Tolerance (or -tol on the command line) to set the
tolerance for the old CAD engine, for OCC healing and for STL import

- removed more unused options

removed most unused, untested or non-working stuff in old CAD code

- bug fix: need to create temporary bounding box and compute CTX.lc
*during* parsing step until we fill the new db on the fly

(Some geo transforms in the parser use CTX.lc for tolerences. But
CTX.lc was always equal to 1 since we only do a SetBoundingBox on
GModel after parsing!)

- cleanup spline interpol (remove duplicate code)

- removed ugly fix in transf mesh of tri surf
- use MFaceVertex params in boundary mesh if available
- cleanup intro chapter in docs

fix err msg

Added basic support for physicals in all mesh formats that ignored physicals
before (stl, vrml, mesh, bdf, pos). This way we can use the physical mechanism
to only save parts of the mesh (like we do it now for msh and unv files).

Next step will be to add an option to only mesh the physicals (and their
dependencies). This is very useful for large models and/or for debugging.

better integration with mac finder

OpenProblem -> OpenProject
MergeProblem -> MergeFile

Layers{N,1} can now be written simply as Layers{N}

deprecated -> warnings instead of errors

make default transfinite subdivision match old version to minimize
backward compat problems

new option to compute char lengths from curvature + removed most unused mesh options

curvature control is ok
divide and conquer algo has been cleaned up

more infrastructure for projection face gui

physical entities can now be defined using a string instead of a number (and
there is a new field $PhysicalNames in the .msh format to keep track of these
strings)

remove elliptic - same as Transfinite with Mesh.Smoothing > 1

- finished volume extrusion
- cleanup ExtrudeParam (plug memory leak + remove unused stuff)
- make netgen the default 3D algo for now (since it actually works)

make explicit regions in extrusions DEPRECATED

remove more attractor crap

cleanup

bidir db: phase 3 -- move all the old geo stuff into Geo/

bidi db: phase 2 -- continued

bidir db: phase 2 -- removed all (well, most of) the old data structures and
algorithms