fix err msg

revert last patch (the behaviour is a bit more complex than that, since we
actually really discrard the physical definitions when we do "save all"), and
just use better wording instead

reverse gui logic for "save_all" (IMHO much easier to understand this way)

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.

pp

better mousewheel interaction

free vol mesh befire surf mesh

ProcessSelectionBuffer should only return true if there is actually
something returned

better integration with mac finder

remove "file_type" for open callbacks: it gives the wrong impression
that files will be treated differently depending on the choice (as is
the case for save callbacks)--this is not true

pretty print

destroy meshRep in deMeshGEdge

OpenProblem -> OpenProject
MergeProblem -> MergeFile

cleanup msg

change the logic in GenerateMesh():

- never reload the model file--we don't need this trick anymore!

- always only generate the mesh we are asked to generate (pressing
  "1D" should *always* mesh the edges; pressing "2D" should only mesh
  the surfaces, unless there is no 1D mesh). This makes the behavour
  much more predictable when changing mesh attributes interactively.

small cleanup of session/option file (don't print help strings by defaul)

add one level of undo in interactive visibility hiding

fix interactive modification of mesh attributes

sanity check: don't try to tetrahedralize a volume with quads on the boundary

clenup projectionFace a bit

don't force (annoying) vis_window->show() aftereach operation

better handling of "negative" physical groups

prepa invert_selection + remove some debug prints

2 fixed bugs and 2 new ones

gmsh 2.0 fixes all of these

fix warning

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

switch license to standard gmsh license

cleanup