Merge branch 'master' into jgrpp-nrt

Merge trunk multiple docks implementation

# Conflicts:
#	docs/landscape_grid.html
#	src/order_cmd.cpp
#	src/pathfinder/npf/npf.cpp
#	src/pathfinder/yapf/yapf_ship.cpp
#	src/rail_cmd.cpp
#	src/saveload/afterload.cpp
#	src/saveload/oldloader_sl.cpp
#	src/saveload/station_sl.cpp
#	src/script/api/script_order.cpp
#	src/ship_cmd.cpp
#	src/station.cpp
#	src/station_base.h
#	src/station_cmd.cpp
#	src/tunnelbridge_cmd.cpp

src/industry_cmd.cpp

@@ -156,6 +156,13 @@ Industry::~Industry()
 		}
 	}
 
+	if (this->neutral_station != nullptr) {
+		/* Remove possible docking tiles */
+		TILE_AREA_LOOP(tile_cur, this->location) {
+			ClearDockingTilesCheckingNeighbours(tile_cur);
+		}
+	}
+
 	if (GetIndustrySpec(this->type)->behaviour & INDUSTRYBEH_PLANT_FIELDS) {
 		TileArea ta = TileArea(this->location.tile, 0, 0).Expand(21);