Bug fix #1937

In unified render, halos can give black/colored overflows. Found it this
happens with halos that are behind the camera clipping range. Halo clip
just had some weird code for panorama corrections...

In the provided .blend of report found 3 more glitches;

- after render particle system with Material Ipo, values for material were
  not restored correctly
- Meshes with particles didn't draw axis (draw extra) on correct location
- Same as above, axis didn't draw in selected color.

source/blender/src/drawobject.c

@@ -2449,7 +2449,8 @@ static void draw_particle_system(Object *ob, PartEff *paf)
 		}
 	}
 	if(paf->stype!=PAF_VECT) glEnd();
-
+	
+	mymultmatrix(ob->obmat);	// bring back local matrix for dtx
 }
 
 static void draw_static_particle_system(Object *ob, PartEff *paf)
@@ -4248,7 +4249,7 @@ void draw_object(Base *base)
 				if(col) cpack(0xFFFFFF);	/* for visibility */
 				if(paf->flag & PAF_STATIC) draw_static_particle_system(ob, paf);
 				else draw_particle_system(ob, paf);
-				cpack(col);
+				if(col) cpack(col);
 			}
 		}