make flatness configurable to fix sphere clipping in contours

web/kiri/lang/en.js

@@ -596,6 +596,8 @@ self.kiri.lang['en-us'] = {
     // OUTPUT CAM
     ou_toll_s:      "tolerance",
     ou_toll_l:      ["surface precision","in workspace units","lower is slower and","uses more memory","0 = automatic based","on animate preference"],
+    ou_flat_s:      "flatness",
+    ou_flat_l:      ["delta z below which two adjacent","points are considered co-linear"],
     ou_zanc_s:      "z anchor",
     ou_zanc_l:      ["controls the position of the part","when stock Z exceeds part Z"],
     ou_ztof_s:      "z offset",