Cutover and ground straps

Add the option to cutover a 3 bushing pot from series to parallel leaving 1 x bushing “dead.”

Allow us to add or remove ground straps on the x2 bushing of a 3 bushing series pot. 277/480 pots should be able to produce straight 480 even with a 3 bushing pot if ground straps are removed properly. Not all real work scenarios will have exactly the transformer you want to make it easiest.