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Add CSI index support for BAM and VCF #1086
This adds support for using CSI indexes on BAM and VCF
This allows doing coordinates of over a gigabase (or specifically 2^30 which is 1073741824)
It seems effective! The 64-bit bit manipulations are done using some floating point math specifically multiplying by two and dividing by two. A proper 64 bit math library could potentially be implemented.