Allow a DIFAT sector to be padded with zeroes #58
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Remove zeroes from the end of the DIFAT; it should be padded with FREE_SECTOR but 0 is seen in practice, specifically with Altium .SchLib files.
This could be simpler (to implement and test) by just trimming the DIFAT to
header.num_fat_sectors
in permissive mode, maybe with a check that only FREE_SECTOR or 0 is trimmed. I'd prefer to do it that way, but I'm not sure if that header field is considered unreliable; if that would be an acceptable fix let me know and I can put together a revised PR.Closes #41