Merge branch 'master' into jgrpp

# Conflicts:
#	src/cheat_gui.cpp
#	src/command.cpp
#	src/command_func.h
#	src/company_base.h
#	src/debug.cpp
#	src/debug.h
#	src/economy.cpp
#	src/engine_type.h
#	src/graph_gui.cpp
#	src/misc_cmd.cpp
#	src/misc_cmd.h
#	src/network/core/os_abstraction.cpp
#	src/openttd.cpp
#	src/saveload/saveload.cpp
#	src/saveload/saveload.h
#	src/settings_type.h
#	src/ship_cmd.cpp
#	src/stdafx.h
#	src/tests/bitmath_func.cpp
#	src/town_cmd.cpp
#	src/town_gui.cpp

src/engine.cpp

@@ -85,6 +85,8 @@ Engine::Engine(VehicleType type, EngineID base)
 		if (type == VEH_ROAD) this->u.road.tractive_effort = 0x4C;
 		/* Aircraft must have INVALID_CARGO as default, as there is no property */
 		if (type == VEH_AIRCRAFT) this->info.cargo_type = INVALID_CARGO;
+		/* Ships must have a non-zero acceleration. */
+		if (type == VEH_SHIP) this->u.ship.acceleration = 1;
 		/* Set visual effect to the default value */
 		switch (type) {
 			case VEH_TRAIN: this->u.rail.visual_effect = VE_DEFAULT; break;