added all the missing "Combine" modes in the parser

The FLTK folks have deprecated fl_ask(), so we need to replace the calls
to fl_ask() with calls to fl_choice()

smaller lc files (%.16g -> %g)

doc 2nd order elements

- Generalized the "View" parser so that we can add new elements more easily
  (the code is *much* shorter, but unfortunately about 10-15% slower)

- Upgraded all post-pro file formats to handle curved (second order)
  elements: SL2, VL2, TL2, ST2, VT2, ... The new version number for the
  postpro files is 1.4

- Added code to automatically split the curved elements into linear
  elements when the view is created. WARNING: this is only a temporary
  solution: weshould generalize Adaptive_Post_View to handle these curved
  elements.

typos

add FAQ entry on PS "ghost triangulation"

add FAQ entry on multi-time-step views

I think Gmsh is ready (performace-wise) to use FastRedraw=0 by default

polish

new rotate script + refactored the anim script into 2 separate files

add line stippling for 2d plots

removed unused Post.Scales option

if no mesh file name is specified, use the problem name to construct one

fix gcc warning

fix compile: iso c++ forbids variable-size arrays

small doc fix

add error check for discrete curves

if there is no selection in the option browser display general options
(instead of nothing)

damn, fix division  by zero in Progress() if we have less than 10 nodes
in the mesh

decompose hexa so that the edges match on each pair of opposite faces

duplicata -> alias

better subdivision scheme for drawing scalar hexahedra (with edges matching
on opposite faces)

axes color

new option to control a view's axes color

treat quads in poly_rep_to_mesh: this way we can also extrude discrete
surfaces meshed with quads

about_window should not be modal: it makes it hard to close the message_window