Resets the bed file and preps it for starting at the start of the \
            genotype data

        Returns to beginning of file and reads the version so that it points \
        to first marker's info

        :return: None

def init_genotype_file(self):
        """Resets the bed file and preps it for starting at the start of the \
            genotype data

        Returns to beginning of file and reads the version so that it points \
        to first marker's info

        :return: None
        """
        self.genotype_file.seek(0)

        buff = self.genotype_file.read(3)
        version = 0
        magic, data_format = buff.unpack("HB", version)
        return magic, data_format