Use CSV instead of TSV

[lewismc]

Hi @cmungall I am going to move forward with serializing the mappings we can generate here to TTL similar to what we have done with the SWEET W3C SOSA/SSN alignment.
In order to build generic useful tooling, it would be helpful if the generated alignments we produce here were manifested as CSV instead of TSV. I was thinking of writing a small Java program which essentially iterates through the alignments and maps them to TTL.
I see that there is an existing csv2tsv.py file... is it necessary to do the CSV to TSV mapping or can you please remove that step and write mappings as CSV only?