Keep absolute offsets in on-disk labels for backwards compatibility. This

requires complications to adjust the offsets to relative when a block
containing the label is read and back to absolute when such a block is
written.  The adjustment is not made on the whole disk slice.

Don't allow setting the offset of partition C to nonzero in in-core labels.
This will cause some (nonstandard) disktab entries to fail.  They will
need to be changed to have relative offsets (and no partitions outside
of the slice).

Don't write protect the (nonexistent) label on the whole disk slice.

Writing labels and bootstraps should work right now (except if there is
no DOSpartition table).

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