Retrieve haplotype strings from individuals in a given range. This is equivalent
to slicing out a section of the transpose of the genotype-sample matrix. Outputs
a FASTA file or NM-matrix with 2N haplotype strings.
Options:
-i FILE input TWK file (required)
-I STRING interval string for target region
-m output haplotypes in tab-delimited matrix form
-n output haplotypes [0,1]-encoded instead of FASTA format