a data.frame contains variants information.
The first file column are fix as Chrome name, position, reference nuclieotide,
alter nuclieotide and INFO. Accession genotype should be in followed columns.
"-" will be treated as Indel. "." and "N" will be treated as missing data.
Heterozygotes should be "A/T", "AAA/A"
hapPrefix
prefix of haplotype names
pad
The number length in haplotype names should be extend to.
hetero_remove
whether remove accessions contains hyb-sites, Character not A T C G
na_drop
whether drop accessions contains missing data ("N", "NA", ".")