Changed surround padding from 1.5 to 1 as per https://opentrv.atlassian.net/browse/TODO-36
Increased holes in front of power and boiler terminals as per https://opentrv.atlassian.net/browse/TODO-56
De-coupled screw hole and PCB fudge fators, increased both independently as per https://opentrv.atlassian.net/browse/TODO-35