Merge branch 'save_ext' into jgrpp

# Conflicts:
#	Makefile.src.in
#	findversion.sh
#	projects/determineversion.vbs
#	src/lang/dutch.txt
#	src/lang/korean.txt
#	src/network/network.cpp
#	src/network/network_client.cpp
#	src/rail.cpp
#	src/rail_cmd.cpp
#	src/saveload/afterload.cpp
#	src/ship_cmd.cpp
#	src/toolbar_gui.cpp
#	src/vehicle.cpp

src/command_type.h

@@ -491,6 +491,7 @@ enum CommandFlags {
 	CMD_CLIENT_ID = 0x080, ///< set p2 with the ClientID of the sending client.
 	CMD_DEITY     = 0x100, ///< the command may be executed by COMPANY_DEITY
 	CMD_STR_CTRL  = 0x200, ///< the command's string may contain control strings
+	CMD_NO_EST    = 0x400, ///< the command is never estimated.
 };
 DECLARE_ENUM_AS_BIT_SET(CommandFlags)