(svn r990) Fix a display bug in the order list:

TTD stores invalid orders different than OTTD, this resulted in empty lines in the order list. With the overhaul of the order system this got worse: no line was shown at all.
Fix this by sanity checking while loading and convert the orders accordingly.

oldloader.c

@@ -1400,7 +1400,8 @@ bool LoadOldSaveGame(const char *file)
 		}
 	}
 
-	memcpy(_order_array, m->order_list, sizeof(m->order_list));
+	for (i = 0; i < lengthof(m->order_list); ++i)
+		_order_array[i] = UnpackOldOrder(m->order_list[i]);
 	_ptr_to_next_order = _order_array + REMAP_ORDER_IDX(m->ptr_to_next_order);
 
 	FixTown(_towns, m->town_list, lengthof(m->town_list), m->town_name_type);

vehicle.c

@@ -16,6 +16,24 @@
 #define GEN_HASH(x,y) (((x & 0x1F80)>>7) + ((y & 0xFC0)))
 
 
+Order UnpackOldOrder(uint16 packed)
+{
+	Order order;
+	order.type    = (packed & 0x000f);
+	order.flags   = (packed & 0x00f0) >> 4,
+	order.station = (packed & 0xff00) >> 8;
+
+	// Sanity check
+	// TTD stores invalid orders as OT_NOTHING with non-zero flags/station
+	if (order.type == OT_NOTHING && (order.flags != 0 || order.station != 0)) {
+		order.type = OT_DUMMY;
+		order.flags = 0;
+	}
+
+	return order;
+}
+
+
 void VehicleInTheWayErrMsg(Vehicle *v)
 {
 	StringID id;
@@ -1896,7 +1914,7 @@ static void Load_ORDR()
 	SlArray(orders, len, SLE_UINT16);
 
 	for (i = 0; i < len; ++i)
-		_order_array[i] = UnpackOrder(orders[i]);
+		_order_array[i] = UnpackOldOrder(orders[i]);
 }
 
 const ChunkHandler _veh_chunk_handlers[] = {

vehicle.h

@@ -28,6 +28,9 @@ static inline Order UnpackOrder(uint16 packed)
 	return order;
 }
 
+Order UnpackOldOrder(uint16 packed);
+
+
 typedef struct VehicleRail {
 	uint16 last_speed;		// NOSAVE: only used in UI
 	uint16 crash_anim_pos;