- added some progress info during the 2nd order mesh generation (so that
  the interface does not freeze for too long)

- cosmetic changes to some other progress messages

Added final bit for 2nd order elements: the middle face nodes for
quadrangular faces (i.e., for quadrangles, hexahedra, prisms and
pyramids).

- removed the quads from the simplex trees (finally...)

  **warning**

  this is a pretty big patch that touches a lot of different files. I
  tried my best to update all the things that needed to be updated,
  but I probably forgot some things... Please test! (especially the
  export routines in obscure formats like SMS, Gref, etc., as well as
  the extrusion code)

- added second order edge vertices for hexas, prisms and pyramids
  (drawing not done yet)

- added sanity check for number of values in post-pro parsed file
  format

- merged all mesh printing/reading routines in Print_Mesh.cpp and
  Read_Mesh.cpp

- cleaned up the statistics code

- define edges_XXX only once

- draw slightly larger/visible mesh points

- make t1.geo/t2.geo faster

- Added nice little buttons in the mesh menu to choose between 1st and
2nd order interactively

- Added 2nd order mesh stats in the GUI

- converted 2D_Recombine and SecondOrder to the EdgesContainer class
- removed the quadrangle hak and the ugly EdgesInVolume global from 3D_Coherence

- Fixed second order mesh generation in 3D (on simplices only at the moment).

- In prevision of the extension to hexas, prisms and pyramids, all elements
are now derived from a new Element base class, which will be used in the
generalization of Edge/EdgesContainer in the future.

Update copyright notice

polish

Some morer work on second order elements

Fix a couple of bugs for 2nd order elements. Seems to work OK for 2D
meshes now. 3D is still kinda flaky, and extrusion is not implemented.

Fix whitespace in copyright headers

Indented all source files using utils/gmshindent

Updated copyright

L'introduction d'une relaxation dans XYtoUV permet de resoudre pas mal de problemes (cf. bench/bugs/xy2uv

which included commits to RCS files with non-trunk default branches.