#234 G02 and G03 circular arcs don't work

[Eyal]

The G02 and G03 arcs don't work sometimes. Here is sample code that ought to draw part of a circle with start point directly below the end point, shaped like a left parnethesis "(":

X0Y0D2
G74
G02
Y1000I5000J500D01

However, no arc is drawn. gerbv did not correctly figure out the values for I and J.

I'm willing to work on a fix for this if wanted.

[Eyal]

Here's an entire file. Compare with the result on http://www.gerber-viewer.com/ . The online site is correct but gerbv is not.

G04 The output looks like a left parenthesis.*
%MOIN*%
%FSLAX23Y23*%
G90*
%ADD10C,1*%

D10
X0Y0D2*
G74*
G02*
Y10000I10000J5000D01*
M02*

[Sergey Alyoshin]

Patch from
https://sourceforge.net/p/gerbv/patches/69/
fix this.