EN1092-1 - Leave the user the choice between table and calculation

The allowable pressure of flanges as per EN1092-1 can be defined by formulas or by table.
In the past AutoPipeVessel was giving the table allowable pressure.
In the new version, it's the calculation with the allowable stress of the material.

It would be nice that AutoPipeVessel leave the choice of the method to the user.