This patch provides IPC-D-356 netlist creation ability to PCB.

The units of the netlist is determined by the units set in the main window when the netlister is run (Metric for mm and Imperial for mils).

Signed-off-by: Bert Timmerman <bert.timmerman@xs4all.nl>
WIP, DO NOT USE: bit rotted branch !

Signed-off-by: bert <bert.timmerman@xs4all.nl>