Quite a large one this time... but now we have:

Edges in Mesh
- adds automatic when you use creases. For other situations; call the
  void make_edges(Mesh *me) in mesh.c. Of course, once in editmode the
  edges are automatically recreated.
- in F9 buttons you can add/remove edges too
- both for Mesh and DisplistMesh, so it speeds up drawing quite some in
  wireframe
- render for edges can't work... edges have no material nor tface nor col..
  so here still the faces are rendered in wire

Creases in Subsurf
- based on the code by Chris McFarlen
- main changes is that now edges are used, saving quite some data in file
- use SHIFT+E in editmode to set edges-sharpness. values go from 0-1
- in F9 buttons you can set draw-crease mode. It draws now blended from
  wire color to edge-select color (as provided in Theme)

Known issue: setting sharpness on 1 cube (subdiv 2) gives weird results
with some values... Chris, can you check?

Further; code cleanups, changing 0 in NULL when needed, no warnings, etc etc

source/blender/src/space.c

@@ -1015,6 +1015,11 @@ void winqreadview3dspace(ScrArea *sa, void *spacedata, BWinEvent *evt)
 							extrude_ika(ob, 1);
 					}
 				}
+            if (G.qual == LR_SHIFTKEY) {
+               if (G.obedit && G.obedit->type==OB_MESH) {
+                  transform('e');
+               }
+            }
 				break;
 			case FKEY:
 				if(G.obedit) {
@@ -1042,7 +1047,7 @@ void winqreadview3dspace(ScrArea *sa, void *spacedata, BWinEvent *evt)
 			case GKEY:
 				/* RMGRP if(G.qual & LR_CTRLKEY) add_selected_to_group();
 				else if(G.qual & LR_ALTKEY) rem_selected_from_group(); */
-				
+
 				if((G.qual==LR_SHIFTKEY))
 					select_group_menu();
 				else if(G.qual==LR_ALTKEY)