- usleep takes microseconds
- work on c solver interf

"pure windows" version (without cygwin) is almost there: the solver
interface now works quite nicely using native Windodiows sockets and
the timers work too. There are still some bugs with binary files and
user-created functions in the parser.

add button in GUI to choose if we should always listen to incomming
connections requests

characteristic lenghts, that would lead to HUGE meshes (this is one
of the most common causes for erroneous bug reports on the mailing list)

- recompute min/max in view after adaptation
- cleanup superfluous resets of TimeStepMin/Max

fixing  orientation of adaptive triangles and quads

I borked the smooth plugin with my cleanups: this fixes it

better export mesh as post-pro view

removed the STEP parser: it's unusable, it makes the parser bigger,
and it introduces conflicts in the syntax.

Rewrote the background mesh code to use the new post-pro octree instead
of the old brick stuff. It's 100x faster ;-)

make the bgmesh work with quads

set bg gradient by default

better averaging

make depend

many fixes in ReadImg (non-square images now work; no default resize; no
default scale change, etc.)

- added little routine to save a post-pro view as a mesh file
- moved all post-pro I/O routines in a separate file

reorder 2D algo menu to match #define numbers (dave)

don't draw mesh nodes by default

add (undocumented) shortcut to disable nouse hovering (speeds up drawing
while still allowing to select by clicking)

fix bunch of gcc4 warnings

mini fixes + pretty print

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)

- 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

Removed all compile-time depdencies on byte ordering (big- or little-
endianness). Replaced them with run-time conversions where necessary (only
for packing/unpacking of colors into unsigned ints). Performance hit
should be negligeable, but this will allow to compile Universal Binaries
on Mac in a single step (instead of having to compile the PPC/big-endian
and the i386/little-endian separately, which wouls be a royal pain in the
butt).

change default browser on non-Win/Mac to firefox

added radial gradient ;-)

don't print the stupid category headers if in 'diff' mode

better z-clipping planes for perspective proj (should also work for objects
far off the z=0 plane now)

make depend

better perspective projection handling (around cog+new icon in gui)

refactored Opengl_Window.handle()

should behave exactly like the old version, but now it is at least (somewhat)
readable and ready to be generalized for more complicated projection matrices

little hack to draw a gradient in the background. Nice for flashy
presentations ;-)