Changes made for Pathfinder PC.

The slitter mode in Pathfinder is essentially continuous shear steps to create smaller blanks out of a bigger sheet of metal. Pathfinder will take the original blank size and say what is possible in terms of how many new blanks can be created. There is a lot of background calculating that will take into account what backstop is being used and what is possible with that backstop. A bug arose in that calculation when the assumption that all fingers are the same was made. The original calculation where the finger distance was subtracted was for a Thalmann TD finger. This subtraction ended up happenning on single folder machines where the backgauge has a spring finger. The subtraction is not needed in this case because the controller will start using the finger when needed. In the case of the TD finger the user chose to use the finger throughout.

The solution was to not subtract the finger distance when the chosen backstop is backgauge only.