added nodal interpolation functions & related stuff

- temp fix I/O to allow skipping $xx fields (this will be common
  with new post-pro)
- prune MElement (move mesh-only stuff in mesh algos)

A minimal Gmsh "null" model can now be embedded with no external dependencies

more work on header pollution

	-) A bug has been corrected in the MeshAdapt Procedure
	-) The 2D Delaunay is now Anisotropic
	-) 3D Sliver removal procedure has been improved
	-) Curvilinear mesh generation has been slightly improved,
	   even if it is still far from done
JFR

better normals

- don't use vertex arrays for quads anymore (they are wrong for non-plane
quad faces): just use triangles everywhere

- removed _links in PView

- various small cleanups

all that was there is back (can be enhanced later)

start reintro high order rep

rewrote vertex array code for meshes in the same way we do it now for
post-processing (much simpler, pretty much same speed, and takes a bit
less memory)

start new gui for reparameterization

we use the Lawson algorithm for 3D surface and the smallest circumsphere
of the triangles as circumcircle.

JFR

patch for Debian folks (gcc 4.3)

- implemented all missing 2nd order representations
- removed unused member functions in GFace + cleaned up GFace::point

- fixed missing return value in OCCVertex::reparamOnFace

- added code to highlight orphan entities (dave's idea)

- added gui for incomplete second order elements

- removed ugly static variables in 1d algo

- made sure we remove all 2d order vertices before generating new ones

- added exception to GPL for triangle/tetgen
- fixed some command line switches
- added option to antialiasing OpenGL rendering

- reimplemented subdivision of extruded meshes
- fix indent + unused var + gcc warnings all over the place

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

more mesh edit work

use MVertex::distance + better check in writePOS