#145 Scale component w/o "corrupting" traces due to misaligned snap points

[usbstik]

Scaling a component shifts its snap / connection points resulting in small "Z" bends placed in circuit traces to accommodate the misalignment. This is generally purely cosmetic, but can be annoying because little nearly-invisible fragments of the "Z" can remain after editing lines.

Perhaps a solution would be to lock snap points up to a threshold level of scale enlargement, and beyond that level the snaps would be scaled to the next grid increment.