simplified Draw_Simplex_Surface

use slightly larger arrows by default (60 pixels instead of 50)

more small cosmetic tweaks:

- don't display the big axes by default anymore (they're not as useful
  as they used to be, since we compute the rotations around the
  pseudo cog instead of the origin)
- set the default opengl font size to 12 (instead of 11)
- add some space between the scales and the labels (10 pixels instead
  of 5)

increase geom line width even more (2 pixels)

Refined mesh drawing code:

- draw surface element edges and/or faces
- draw volume element edges and/or faces
- consistent color choices between surface and volume elements
- wider geometry lines
- better defaults

better positioning of text labels on mesh and geometry

better test to check when to abort parsing

- 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

nicer layout of mesh color pane

copy & paste buglet

- 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.

Improved xytouv() and xyztouv() by trying different initial guesses in the
newton algo (before relaxing). Should be more robust than what we did before.

added new constructor with no arguments in prevision of Degre2 cleanup

Fixed computation of vertex->u param in curve extrusion

- Fixed drawing of 2nd order triangles and tets
- Restored drawing of 2nd odrer vertices in different color

cleanuip (removed duplicate code) + new function u() to get the abscissa
more easily

better progname

another example where the simple projection scheme fails

add comments

final tweaks

more tweaking

add "-cvs" extra tag for non-released versions

introduced GMSH_EXTRA_VERSION so that we can differentiate official/unofficial
releases

lena->lenna

arrow stuff is fixed

make parser && make depend

Fixed 3D cylinder/arrow drawing code when dir vector is // to z-axis