Added 2 options to control polygon offset. Instead of trying to guess
when a polygon offset is useful (it's no that simple when we combine
geo+mesh+some views), we just apply it conditionally to all surface
drawings.

optimize ExportLc

test if there is anything to save before opening the file

generalized ExportLcField to all element types

fixed computation of Min/Max when the view contains different element types

pretty print messages and comments

Ctrl+a->Shift+a

Replaced all *non-modal* Fl_Windows with either Dialog_Windows or
Main_Windows, which are derived from Fl_Window amd correctly process
the OS-specific "Close Window" shortcuts (Pomme+W on MacOS, Alt+F4 on
Win32).

Opengl_Window should not take the keyboard focus by force as soon the
mouse enters its area (this messes up the processing of other windows
shortcuts). Instead, it should only force the focus when it gets a
mouse click. This is much nicer.

prevent crash when no contour

Small aesthetic changes:

- Only 'title-capitalize' window titles and menus; the rest should be
  capitalized like normal english sentences

- The window title should be exactly the same as the menu item
  (without the ellipsis character if there is one)

Print "Shift+Ctrl" instead of "Ctrl+Shift" in the docs, since this is the
way both FLTK and MacOS do it

show 'About' window in the middle of the screen

final shortcut changes decided by Laurent

- On Mac, Cmd==Ctrl
- better menu dividers

- reworked the keyboard shortcuts with Laurent (our very own Macintosh
  Usability Guidelines Expert)

- new smoothing option for jpeg output

- new small GUI dialogs for ps/pdf/jpeg/gif/msh output (makes the
  'format' menu in the file dialog much shorter)

bulletproof parse_string and skip_until so that we don't crash and simply
report the error + use Msg instead of YY_FATAL_ERROR in YY_INPUT

Fixed all (well, most) string memory leaks in the parser. I've run
automated tests on all the demos and benchmarks, and I did not see
anything suspicious (no crashes, double frees, etc.)

******************************************************************
******************************************************************
*********** Pretty please, please give this version **************
*********** a try, especially on files with lots of **************
*********** loops, includes, arrays of variables,   **************
*********** etc., and report any problems. Thanks!  **************
******************************************************************
******************************************************************

For/EndFor loop corrections  exposed small bug here :-)

Don't optimize Gmsh.tab.o: on many architectures, g++ -O2 generates
assembly code too large to be addressed correctly. This will hopefully
fix the build problems reported on ppc.

don't need UpdateViewsInGUI in parser anymore

better test for invalid For/EndFor loops

Don't update the views in the GUI directly after each view is created.
Instead, wait until the whole file is read. This speeds up the creation
of the interface dramatically when we have a large number of views in
a single file. (In my code I routinely merge around 1000 views
in a single file to do animations; with this patch, the GUI creation
time goes from 30 seconds to less than 1 second.)

simpler solution to 2D primitive sorting problem

translate all 2D objects before drawing them: this is the easiest way
to get GL2PS to put them "in front"

use the alignement capabilities of GL2PS for TeX output (this allows gmsh to
create nicely aligned labels even with equations)

fix tex output in gl2ps for large scenes

typo

optimize jpeg coding to produce smaller files (patch from Dave Coffin)

last missing routine (to combine text strings time steps). ouf.

- changed the Shift+XX menubar shortcuts into either Ctrl+XX or
  Ctrl+Shift+XX (we shouldn't use Shift+XX shortcuts in the menubar,
  in particular on Mac, where the shortcuts conflict with input
  text fields)

- exchanged the meaning of Ctrl+s and Ctrl+Shift+s, as this is what
  most people expect