(svn r14680) -Feature(ette) [FS#2434]: Use property 4 (model life) also for wagons.
Setting property 4 to 0xFF will protect the vehicle (engine or wagon) from expireing. (Necessary since early introduction dates)
Savegames will only be affected after 'resetengines'.

bin/lang/*
bin/opentd*
bundle/*
config.cache.*
config.log
config.pwd
Makefile
Makefile.am
media/openttd.desktop*
objs/*
src/rev.cpp