[PythonCAD] intersecting construction lines?

[Russ Nelson]

Art Haas writes:
 > The patch below contains the changes listed above, and I've
 > also sent the changes to the public repo so people using
 > Subversion can get the fix with 'svn update'.

Woo hoo!  Well done.  Now I have to remember what I was doing when I
ran across this.  :-)

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