-> 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.

source/blender/src/editmesh_loop.c

@@ -496,7 +496,8 @@ static CutCurve *get_mouse_trail(int *len, char mode, char cutmode, struct GHash
 	float *scr, mval[2], lastx=0, lasty=0;
 	
 	*len=0;
-	stolerance = (int)(G.scene->toolsettings->select_thresh * 1000);
+	stolerance = 75;
+	
 	curve=(CutCurve *)MEM_callocN(1024*sizeof(CutCurve), "MouseTrail");
 
 	if (!curve) {
@@ -788,7 +789,8 @@ static float seg_intersect(EditEdge *e, CutCurve *c, int len, char mode, struct
 	float  threshold;
 	int  i;
 	
-	threshold = 0.000001; /*tolerance for vertex intersection*/
+	//threshold = 0.000001; /*tolerance for vertex intersection*/
+	threshold = G.scene->toolsettings->select_thresh / 100;
 	
 	/* Get screen coords of verts */
 	scr = BLI_ghash_lookup(gh, e->v1);