                              Loops
-----------------------------------------------------------------

 Dust can perform nested FOR-loops, the loop-counter is equal to 
 the loop-variable of the innerst loop.
 The loop-counter is the number inserted into a string containg
 format-commands.

 Syntax:

  FOR(<loop-variable>,<from>,<to>[,<step>])
   .
   .
   .
  END

 Example:

  for(i,1,10)
   echo("unformatted:$, formatted:%")
  end

 Contains a string format-commands so this commands will be replaced by
 the recent value of the loop-counter.

  $ - inserts the value unformatted
  % - inserts the value formatted

 Example:
 A string "$. Objekt: obj.%" is changed into "23. Objekt: obj.0023" if
 the loop-counter was 23.
