Improve DRC text with location data

[Peter Clifton]

Feedback from John Bass:

It would be nice if the text on the left side, included layer number, actual width found that violates the DRC specifications, and the X/Y pairs for a line that spans the DRC failure point.

[Chad Parker (parker-charles)]

This is involved enough that I didn't have time to get to it for this release. We'll see about what we can do for the next one.

[Chad Parker (parker-charles)]

Much of this is already done. The only bits that aren't are the minimum clearance and minimum overlap violations.

We find these cases by testing for copper overlap with a bloated or shrunk version of the object in question, the limiting cases. This means that we don't actually compute the distance from one object to the other.

We may have all the math in place to do these calculations, but, I not in a way that lets us easily calculate the desired parameters. I'll have to think a bit on the best way to do this.