usage: blobtools seqfilter       -i FASTA -l LIST [-o PREFIX] [-v]
                                    [-h|--help]

    Options:
        -h --help                   show this

        -i, --infile <FASTA>        FASTA file of sequences (Headers are split at whitespaces)
        -l, --list <LIST>           TXT file containing headers of sequences to keep
        -o, --out <PREFIX>          Output prefix
        -v, --invert                Invert filtering (Sequences w/ headers NOT in list)