Support description in FASTA/FASTQ input when creating perfect reads

[mmokrejs]

to_perfect_reads.py does not support inputs which have a description text after an identifier. It just blindly appends the numbers to whatever text is present on the line. If the line contained some description words separated by spaces from the identifier it will append the values after the description.

This commit ensures the values will be appended to the FASTA/FASTQ identifier even if it is followed by a description text.