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

are more correct)

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 mousewheel interaction

pretty print

cleanup msg

fix interactive modification of mesh attributes

clenup projectionFace a bit

better handling of "negative" physical groups

prepa invert_selection + remove some debug prints

first gui hooks for projection stuff
+ fix potential crashes in drawMeshGxxx if mesh.changed was not set correctly

Add middle edge points to compute mean plane of plane faces with less
than 3 bounding points

better conv warning

- polish gui for interactive visibility
- upgrade tetgen to latest available version

make sure we don't store physical tags multiple times per entity

don't throw an exception if attributes are not defined -- just issue an error

algo to compute normal for plane gmsh surfaces was wrong (sign could be wrong)

slightly better fix than before

add extra arg to XYZtoUV so we can use it also for point that are not on
the surface

- revert convergence check on xyz error in xyz2uv: just issue a warning

- remove computation of mean plane during meshing: it's not used anymore
(we only use the mean plane for plane Gmsh surfacesm and it is already
computed correctly in the gmshFace constructor)

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

reimplemented transfinite volume meshing algo (not complete yet)

remove unused stuff + invert default sorting order in vis browser

forgot to classify vertex in STL reader

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

fix netgen optimization (need tets with neg vol)

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)

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

extrude edge+face (only "recombined" for now; we'll implement subdivision
into simplices "globally" later)