- improvement for edge/face select

- edges now sample on three locationsm gives more hits
  - own version of glPolygonOffset remains cumbersome... but for select
    now the selection routine gets more offset than draw.

- first attempt to clean drawobject.c and displists
  - generic call for draw object in backbuf for select purposes, cleans up
    a lot in the other calls.
  - also to verify if we can (in future) use this for vertex/edge/face
    select, but the whole drawobject code works against me... this is
    for another refactory (incl. displist) and out of the focus for now

- subsurf.c: now creates new faces in order of original. Not used yet, but is
  handy to recover the original order for selection/paint purposes.

source/blender/src/drawmesh.c

@@ -507,7 +507,7 @@ void draw_tfaces3D(Object *ob, Mesh *me)
 
 	glEnable(GL_DEPTH_TEST);
 	glDisable(GL_LIGHTING);
-	bglPolygonOffset(G.vd->dist);
+	bglPolygonOffset(1.0);
 
 	/* Draw (Hidden) Edges */
 	if(G.f & G_DRAWEDGES || G.f & G_HIDDENEDGES){ 
@@ -631,7 +631,7 @@ void draw_tfaces3D(Object *ob, Mesh *me)
 	/* Draw Stippled Outline for selected faces */
 	mface= me->mface;
 	tface= me->tface;
-	bglPolygonOffset(G.vd->dist);
+	bglPolygonOffset(1.0);
 	for(a=me->totface; a>0; a--, mface++, tface++) {
 		if(mface->v3==0) continue;
 		if(tface->flag & TF_HIDE) continue;