(svn r18974) -Fix [FS#3578]: CMD_BUILD_ROAD missed CMD_AUTO. Also do not access tiles anymore after clearing them; that fails either in test or exec run.
{CmdRemoveLongRoad,CMD_NO_TEST|CMD_AUTO},// CMD_REMOVE_LONG_ROAD; towns may disallow removing road bits (as they are connected) in test, but in exec they're removed and thus removing is allowed.