Fix determination of which corners need sharpening when doing the female side of the inlay.  Previously it would sharpen some concave and some convex corners with no obvious pattern.  With this change the user-specified angle cutoff works correctly.
Fix determination of which corners need sharpening when doing the
female side of the inlay.  Previously it would sharpen some concave
and some convex corners with no obvious pattern.  With this change
the user-specified angle cutoff works correctly.

danheeks/heekscnc,danheeks/heekscnc,danheeks/heekscnc,danheeks/heekscnc