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Add a get_track_format() method that can be overridden to supply format
variations for any track and head. The code is generalised to account for such
variations. The default method returns the passed format, so this change is
neutral for existing formats.
Simplify the FLEX DSK format code. There are now simply format variation
descriptions for the second track that have the sector ID continuing in
sequence from the first track, rather than specialized code.
Extend the FLEX format to support variations in the sectors ID of the first
two sectors. The FLEX 6800 boot sectors have IDs based at zero rather than
one. Extend the FLEX format to support variations for which the first track,
on both sides, is single density on an otherwise double density disk which was
historically a common format.
Extend the OS9 disk format to support variations for which the first track, on
only the first side, is single density on an otherwise double density
disk. OS9 for the SWTPC and Gimix typically used such formats.
Extend the OS9 disk format to support variations with a base sector ID of zero
in contrast to the existing COCO OS9 format which uses a based sector ID of
one. The OS9 format identification code is extended to rely on the optional
information stored in the OS9 LSN0 header to identify COCO format disks, and
all COCO format disks appear to have this optional information in a regular
enough format.
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