passes Directory Reference

Files
	stitch.hpp
	Stitching vias (doc 05 §39.3): after routing, vias of a plane's net are added where fills of that net lie over each other on two or more layers (plane stitching), and next to the vias of signals that need a reference plane (return-path stitching).
	style.hpp
	Style metric (doc 05 §39.2): how tidy a set of tracks is, per connection and per board.
	widen.hpp
	Power track widening (doc 05 §39.1): after routing, new tracks that are narrower than they should be are made wider where the exact check allows it.