to be abstract views, and modified the LVS scripts accordingly
(they no longer need a special version of the netgen setup
script). LVS was verified on both caravel and caravan using this
setup.
connections to the core side VCCD1 and VSSD1 on the clamped3 pads.
Also added scripts for running LVS on chip_io to the mag/ directory,
and revised the scripts so that they will only re-run extraction if
there is no netlist file in the mag/ directory.