rewrote the smooth normal routines:

- the averaging is now done by clusters, which is much better for
  geometries that have sharp edges  (it's a little slower, but the
  visual results are much better)
- there is now only a single smooth normal container in the mesh
  (instead of one per surface)

add missing sanity check in interpolateUBS

- new button under the graphic window to temporarily disable mouse
  selection (speeds-up redrawing of very large models + permits to
  rotate/zoom-in a model in selection mode even when the whole screen
  is full of selectable entities--e.g. a surface mesh)

- new "lasso" selection mode (to select entities using the same kind
  of lasso as the lasso zoom: just Ctrl+click, then drag the mouse in
  selection mode; the shortcuts are the same as for the lasso zoom)

- it is now possible to unselect entities using the middle mouse button
  (only for the creation of physicals at the moment; not sure if it's
  useful in the other cases)

- new button in visibility browser to invert the current selection
  (very useful e.g. when multiple physical entities are associated
  with a given elementary entity, in order to "peel" away the model
  when adding new physicals; cf. philou)

- changed meaning of Escape shortcut (cancel lasso or toggle mouse
  selection) + restore standard fltk Escape handling for all dialog
  windows

- updated copyright string

- new mesh label mode (coordinates); all label types are now also
  available for mesh vertices

- added option in 'Print Option' dialog to disable printing of help
  strings

- added a comment string with the date when creating a new file

- new snapping grid for adding points in the GUI

make depend

bug fix when using "rough algo" to create the mean plane: the normal
was computed with reserve orientation compared to the normal case.

don't optimize transfinite volumes!

trying to fix the transfinite volume bug introduced by the 'left' and
'alternate' transfinite surface changes made a while ago

fix stat print for pyramids

upgrade triangle to version 1.6

disable applyOptimizationPatterns for now

print 1D elts in unv format + fix 2nd order 1d elts in unv format

indent + cleanup messages (somewhat)

fix gcc warnings + disable BDS optimization for now (it leads to wrong
results with gcc 4; maybe we should have more intelligent tests in
configure or in the makefiles to enable/disable optimization depending
on which compiler is used)

make it possible to add second order vertices for a mesh read from
a file (without cad)

if the mesh is partitioned, save the partitions in the .msh file

add missing copyright headers

always save the surface elements in unv format (not just when the surface is
not part of the boundary of a volume)

make depend

moving all external code to contrib subdirectory

use it now with -partition N for N partitions
only works with tets and triangles
output should be added (useless for now)

with node ordering corresponding to positive orientation (volume).
Test implemented for 1st and 2nd order elements, but only 1st order hexas
have actually been tested!

simpler tetgen integration by Jozef Vesely