Blender Git Loki

-> Adjustable Tolerance for Knife Vertex Cutting

Previously had Vertex snapping in knife tool adjustable by the 'threshold'
value in the 'Mesh Tools' panel. This was actually a misunderstanding on
my part of a user request (oops). What was really needed was to make the
sensitivity of intersection code for vertex cutting adjustable. Vertex Snap
is now set at same tolerance as vertex selection.