vcf_file: VCF file (subdirectory "data")
Description
A VCF file stored in the directory "data" of the PopGenome package.
The file (unpacked) have to be stored in a folder (for example "VCF").
Note, many VCF-files can be stored in this folder. If the
VCF file is too big, split it into chunks (by position) !
PopGenome is able to concatenate them afterwards.
readData("VCF",format="VCF",FAST=TRUE)