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Long chr region#2009

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jkbonfield:long-chr-region
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Long chr region#2009
jkbonfield wants to merge 2 commits into
samtools:developfrom
jkbonfield:long-chr-region

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A test bed for samtools/hts-specs#655

See samtools/hts-specs#655

When we've had to split long chromosomes up due to being >2Gbp long,
these header fields provide a mechanism to report the originating
chromosome and location within it.

This PR adds support for these in the iterator interface, so a range
query can use the original chromosome name and coordinates, expanding
to one or more sub-queries in the split chromosomes.

The resulting returned data is not remapped to the original names /
positions, as this is a substantially bigger task.  It may be dealt
with later in a follow-up PR.

Signed-off-by: James Bonfield <jkb@sanger.ac.uk>
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