This is an example of using a lua script to collect field data
on a regularly spaced grid of points.  To run the example:

1) load qfld1.fem into the preprocessor in the usual way
2) push the "turn the crank" button to analyze the problem
3) push the "glasses" button to view the solution
4) select File|Open Lua Script off of the main menu of the postprocessor
5) pick out the file "grid.lua" and hit OK
6) a file called "values.txt" will then be written automatically with
   the field values separated by spaces.
