allow users to download chromosome sequence by coordinates
allow users to download chromosome sequence by coordinates


Former-commit-id: 835d746ee726f6aadb17293aaed16c4c45e0ffbc
drhee/toxoMine,drhee/toxoMine,drhee/toxoMine,drhee/toxoMine,drhee/toxoMine,drhee/toxoMine,drhee/toxoMine,drhee/toxoMine,drhee/toxoMine