(svn r570) -newgrf: Support for custom aircrafts via GRF files. Planeset seems to work :). Also use aircraft_vehinfo() instead of the old tables (pasky).

static const byte _dir_to_straight_trackdir[4] = {
	0, 1, 8, 9,
};

static const byte _reverse_dir[4] = {
//	3, 0, 1, 2
	2, 3, 0, 1
};