Faulty DVD sub pictures when size is odd

[LogicDeLuxe]

DVD requires to have each sub picture at an even size. Some DVD players (such as the picky SEG New Orleans) will behave strange when sub pictures have an odd size. Those should be padded with one additional dummy byte to get them even (which any other sub picture tool I'm aware of does). The sub picture size indicator at the beginning has to be increased by one as well in this case.