- "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

after CreateOutputFile, preventing consecutive "Print" in the parser
to change format correctly

box of e.g. a view when merged in a script

Fix make source

drawing. We are still very slow, though:

- we should preprocess the mesh to draw large triangle/line strips
- we should store the normals (and NOT IN A SET!!)
- we should store the elements in a structure allowing a faster traversal
- we should do all this in single precision

The same remarks apply for the post-processing stuff. Worse, in
post-pro, due to Get_Coord and SaturateValues, we basically copy ALL
THE DATA SET at least one per drawing, even when we don't have to (no
Raise/Offset/Saturate)... This is horrible, and makes us lose all the
advantage of the fast list_PointerFast stuff I designed in the forst
place. Ahhh, the cost of generality...