Add some Apple-specific stuff. Thanks to Greg Ercolano
<erco@3dsite.com> for hints on how to do the new XML-based
packaging. No more resource forks!

Use COMPILE_AND_EXECUTE and fix the if test.

Removed unused variable.

Update for 1.36

Introduce OpenGL display lists for drawing meshes. Does not seem to
work much faster on my machine, though.

Added an option to set the number of subdivisions used when drawing
spheres (when geometry, mesh or post-processing points are drawn as 3D
spheres). You can test with:

gmsh tutorial/t5.geo -string "Geometry.PointType=1; Geometry.PointSize=8; General.SphereSubdivisions=10;"

Add some comments on the TWO_FACE lightning bug. To be fixed later.

normals. This caused the blurred stuff when changing time steps...

right-clicking on the view button (which nobody found without asking
me... and was not easily available on Macs with 1 button mice), there
is now a small arrow (with a tooltip) next to the view
button. Clicking on this arrow pops up the option menu.

Change default post-processing iso mode to continuous map. The old default value just confused too many people doing 3D stuff.

- "OK" is to agree with what in the dialog *AND* close the dialog
- "Apply" is to apply the current values selected in the dialog, but
   leave the dialog open
- "Cancel" is to close (hide) the dialog and *NOT* apply the
   changes that might have been made in the dialog

Also increased default width of buttons