Merge branch 'master' into jgrpp

# Conflicts:
#	src/depot_type.h
#	src/lang/german.txt
#	src/order_gui.cpp
#	src/pathfinder/yapf/yapf_rail.cpp
#	src/script/api/script_window.hpp.in
#	src/settings_table.cpp
#	src/train_cmd.cpp

src/depot_type.h

@@ -10,9 +10,13 @@
 #ifndef DEPOT_TYPE_H
 #define DEPOT_TYPE_H
 
+#include "station_type.h"
+
 typedef uint16 DepotID; ///< Type for the unique identifier of depots.
 struct Depot;
 
+static const DepotID INVALID_DEPOT = (DepotID)INVALID_STATION;
+
 static const uint MAX_LENGTH_DEPOT_NAME_CHARS = 128; ///< The maximum length of a depot name in characters including '\0'
 
 #endif /* DEPOT_TYPE_H */