add tabix to speed up the process in reading vcf file with specific chromoID
add tabix to speed up the process in reading vcf file with specific chromoID

bioinformatics-centre/AsmVar,ShujiaHuang/AsmVar,ShujiaHuang/AsmVar,bioinformatics-centre/AsmVar,bioinformatics-centre/AsmVar,ShujiaHuang/AsmVar,ShujiaHuang/AsmVar,bioinformatics-centre/AsmVar,bioinformatics-centre/AsmVar,ShujiaHuang/AsmVar,bioinformatics-centre/AsmVar,ShujiaHuang/AsmVar