Illumina-1.3 format conversion to Illumina-1.8 format via BioPython.

def phred_13_to_18(self, new_path=None, in_place=True):
        """Illumina-1.3 format conversion to Illumina-1.8 format via BioPython."""
        # New file #
        if new_path is None: new_fastq = self.__class__(new_temp_path(suffix=self.extension))
        else:                new_fastq = self.__class__(new_path)
        # Do it #
        self.format = 'fastq-illumina'
        new_fastq.open('w')
        new_fastq.handle.writelines(seq.format('fastq-sanger') for seq in self)
        new_fastq.close()
        self.format = 'fastq-sanger'
        # Return #
        if in_place:
            os.remove(self.path)
            shutil.move(new_fastq, self.path)
            return self
        else: return new_fastq