Another error with particular TBI file

[cmdcolin]

Here is a snippet of a vcf with a failing tabix file

failing_tabix.tar.gz

Ends up getting a negative chunkCount

[cmdcolin]

@garrettjstevens i'll go ahead and take a look at this

[cmdcolin]

The reason this was happening was due to chromosomes of length greater than 2^29 being indexed which is technically a tabix limit but older versions of tabix allowed it

Tabix 1.2.1 allows it but tabix 1.9 gives a proper error

[E::hts_idx_push] Region 536930580..536930581 cannot be stored in a tbi index. Try using a csi index with min_shift = 14, n_lvls >= 6
tbx_index_build failed: G3116.vcf.gz

[cmdcolin]

Possible fix in #18