ATRI pedestal loader needs to be hardened

[clark2668]

The ATRI pedestal loader function needs to be hardened. In particular:

• The function should check if the file it's being asked to load actually exists. And if not, error out)
• Should check to make sure that every capacitor gets a pedestal value (that is, that the pedestal file is somehow not incomplete or too large). And error out if not.