adds bgziptabix convenience script
adds bgziptabix convenience script

ekg/vcflib,travc/vcflib,vcflib/vcflib,vcflib/vcflib,ekg/vcflib,ekg/vcflib,ekg/vcflib,ekg/vcflib,travc/vcflib,vcflib/vcflib,vcflib/vcflib,vcflib/vcflib,vcflib/vcflib,vcflib/vcflib,travc/vcflib,vcflib/vcflib