gEDA-dev: global puller status

[DJ Delorie]

> Seems to me, the local puller needs an arc to start with.

Specifically, the intersection of an arc and a line.

> Is this true for the upcoming global puller too? Or does it apply in
> a similar way to straight lines only tracks?

The global puller doesn't need arcs, in fact, if you give it one it
leaves it alone.  The global puller looks at all line-line
intersections.