Inssues Hole cutting

Had a play with this, Axis metric sim shows same behavior, goes through arcs only on all 3.
Probably because both G3 lines have the same starting point so nothing to move to, despite different I and J values.
Changing the G0 value changes the result, as it also moves the end point of the first G3 line, so it has where to move to.
Changing the first G3 line X by 0.001 below makes everything work properly, while changing it by 0.001mm above will completely erase the circle. The opposite is true for Y value.
Replacing G3 with G2 in any line works as expected, so does replacing both.

Thanks Tommy.

I do believe this is an issue with the "FUZZ" values not changing with the machine units.

If I import stdio.h into _posemath.c and add a print statement after the line Phill changed in the previous commit (approx line 1851), to print "d", when I run the file, I get the following results...

IMPERIAL CONFIG:



METRIC CONFIG:

Nothing.  The line is never reached because d is not < DOUBLE_FUZZ.

However, if I change the line to compare against CART_FUZZ I get:



The other circle check around line 1862 uses CART_FUZZ as well, so I think changing line 1851 to be the correct route of action...

Wait, if G2 works but G3 does not, is there something different for those two in code? I mean except the left-right side.
Need sleep badly...

I pushed a fix for this to both 2.9 and master.  

You should be able to update after the buildbots do their thing.