Various stuff in one commit;

- Added (BKE_utildefines.h) POINTER_TO_INT(poin) and INT_TO_POINTER(int)
  defines, to help fixing issues with switch to 64 bits systems. This
  assumes that a) not more than 16GB mem is used and b) that address
  space is below the 1<<35 value. The latter has to be confirmed, but it
  seems to conform the current 64 bits generation of OSs (for mallocs).

  Needless to say; use long if you want to store pointers! This is for
  temporal fixing.

- Added editmesh version for mesh-octree lookups, not used yet.

- Fix: ESC on armature posemode restored the actions, should not happen

- Fix: If in NLA an action was 0 frame long, it caused draw error

- Fix: Click on name in Action Window now activates Bones

- Fix: "Snap to" options in Armature editmode now use X-axis mirror edit.

source/blender/src/drawnla.c

@@ -190,6 +190,7 @@ void map_active_strip(gla2DDrawInfo *di, Object *ob, int restore)
 		map= stored;
 		map.xmin= get_action_frame(ob, map.xmin);
 		map.xmax= get_action_frame(ob, map.xmax);
+		if(map.xmin==map.xmax) map.xmax+= 1.0;
 		gla2DSetMap(di, &map);
 	}
 }