fix boundary issue with new haplotype testing approach
fix boundary issue with new haplotype testing approach

mateidavid/nanopolish,mateidavid/nanopolish,jts/nanopolish,jts/nanopolish,jts/nanopolish,mateidavid/nanopolish,jts/nanopolish,jts/nanopolish,mateidavid/nanopolish,mateidavid/nanopolish