gEDA-user: pcb insulator layer

[DJ Delorie]

In draw.c's DrawEverything, look for the two lines like this:

	      r_search (PCB->Data->via_tree, drawn_area, NULL, pin_callback,
			NULL);

(one has pin_callback, one has hole_callback)

You want to skip those on your insulator layers.

You can skip the pin_tree ones too if you need to.

This is also the place to do "magic" specific to your board, like
drawing vias with bigger copper, copying smt pads, etc.