force a buffer flush when we abort the parser due to too many errors

don't force a full clean for distrib-* rules: if we want a "make clean",
let's do it by hand

fix crash when saving options and all views have been removed

face -> quad. face

pretty print

document the optional second list in Layers

the famous "piece.geo" with an explicit volume definition (netgen test)

fixed old extrusion mesh generator (used the old 99999 volume hack!)

Removed the old test on ZonLayer: we actually WANT to use the automatic
volume if we set the layer number to 0. This is really pretty nice: we
can now get either automatic or manual numebring in all the extrusion
commands.

- All extrusion commands now return a list of 2 numbers (instead of 1):
  the first, as before, is the number of the "top" of the extruded region
  (i.e., a point for extrude point, a line for extrude line, ...), the
  second is the number of the "body" of the extruded region (i.e., a
  line for extrude point, a surface for extrude line, ...).

- "Extrude Surface" now always creates a new volume (automatically),
  EVEN WHEN THERE IS NO LAYERS SPECIFICATION. This makes it consistent
  with "Extrude Point" and "Extrude Line", which always create new
  curves and surfaces, respectively.

  Important Note: you will have to modify your old .geo files to avoid
  duplicate volume definitions if you use "Extrude Surface" without
  extruding the mesh (i.e., without the "Layers" command). These
  duplicate volumes would be harmless, but they would srew up your
  physical volume definitions later on...

  * Solution 1: use the new volumes (recommended). To do this, just
  remove your old extra volume definitions and let Gmsh create the
  extruded volumes for you. (To retrieve the volume number created by
  Gmsh, use "aa[] = Extrude Surface {...};;": the volume number is
  "aa[1]".)

  * Solution 2: keep the old volumes.

  a) clean way: retrieve the new volume number (aa[] = Extrude Surface
  {...};;) and delete the new volume with "Delete { Volume aa[1]; }"

  b) dirty (but handy) way: since, in order to create the new volumes
  with the less impact possible, Gmsh uses "low" numbers (actually,
  forcing "Geometry.OldNewreg=0") for the new volumes, just remove all
  "low number volumes". For example, if you have 4 "Extrude Surface" in
  your file, you can then just do "Delete{ Volume {1:4}; }"

Voila :-)

update command line help

bulletproof FindCurve/Surface + uniformize error messages

"Length -> Characteristic length" button label

removed SELECT test for mesh nodes: we don't use it

upgraded Triangle to version 1.5

- set OLDCINCLUDE flag for netgen on sgi
- use FLAGS in Netgen/Makefile

added sanity check for number of nodes per element

iostream.h -> iostream

make depend + update docs

don't optimize netgen meshes by default + use Msg(FATAL) when something bad happens

nicer physicals

update docs

forgot this one

added optimization hooks in the interface (GUI + comamnd line)

mesh optimization polish (redirect netgen messages to the GUI, etc.)

really simplex cube example

added "Optimize 3D" button in the GUI

We can now use Netgen's optimization pass on our own Delaunay meshes. It seems
to work pretty well on small examples, but it definitely requires more
testing :-)

a version of piece.geo with correct surface orientations so that
it works with netgen

- added small routine to orient all the surfaces in a Surface Loop
  consistently

- fixed orientation of lines/surfaces in holes, *IF* we suppose that
  holes are defined consistently with exterior boundaries (warning:
  there is currently *NO* check for this in the code)

more fixes for netgen

Added hooks to optimize our meshes using netgen (in particular: the "special"
volume 99999 is now cleaned up after use and all the elements/vertices are
transfered back into the original volumes)

As a bonus, this finally allowed me to remove the ugly hacks in the volume
mesh drawing routines...

optimize netgen mesh import (much much faster now for large meshes)

- revert the OPTIM change on 3D_Mesh.o
- fix bustage for --disable-netgen

keep netgen in make source