gEDA-user: non-circular arcs

[DJ Delorie <dj@xxxxxxxxxxx>]

I checked three gerber viewers and got three different results, when
plotting a non-circular arc (pcb supports them, with some bugfixes I
did at the code sprint).  The spec doesn't say what to do about such
cases, so I changed the gerber output to draw non-circular arcs as a
series of short line segments.  The code automatically sizes the
segments to maintain a "smooth" path.

BTW, "non-circular" means width != height.  I.e. pseudo-ellipses.


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