not work yet. Commented lines have been commit for CYAN/RED stereo but
this kind of stereo mode is not convincing.

- new GetEnv and GetString functions

- added automatic transfinite corner selection for volumes

- use std::string in Draw_String & co
- add pyramid test

- deprecated "Complex Volume"

do this, but some people actually do...)
- added some attractor examples

- fixed embedded version
- removed OCC STL meshgen for now (OCC/triangle clashes with our own version
of triangle)

- fix crash in Plugin(MakeSimplex)
- fix main bbox computation when one view has an empty bbox

Bezier curves are broken

remove extra volume

added General.MinX, General.MaxX, etc. so that we can easily get the
min/max of a model (useful e.g. to create a box around an imported
STEP model)

added example of mixed step/geo model

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

reimplemented transfinite volume meshing algo (not complete yet)

show how to mesh the volume from a surface STL

make mouse selection mode a regular option (for Ruth)

fixed ugly extrusion syntax (finally!)

extrusions are now specified in the same way as all other transformations
(the old syntax is still available, but is deprecated)

mini fixes + pretty print

Removed the last bits of the "Discrete Surface/Line" stuff.

Gmsh can now simply read a .msh file, and use it as the boundary mesh
of a 3D mesh. For an example on how to do this, cf.
demos/sphere-discrete.geo.

This complements nicely the STL remeshing stuff: Gmsh can now
for example very easily be used to extrude surface meshes that
come from other tools.