Work on creases editing.

- while editing creases (SHIFT+E) it works like scaling now (towards or
  away from center selection).
- ESC while crease edit now works.
  (note; doesnt fit in Trans structs...)
- button 'draw edges' and 'draw creases' now exclude each other

source/blender/include/butspace.h

@@ -339,6 +339,9 @@ enum {
 #define B_CHROMADEPTH	2084
 #define B_MAKEEDGES		2085
 #define B_DELEDGES		2086
+#define B_DRAWEDGES		2087
+#define B_DRAWCREASES	2088
+
 
 /* *********************** */
 #define B_CURVEBUTS		2200