Updated DNA gramplet ready for review

[emyoulation]

@GaryGriffin

When Nick wrote the original version of this gramplet, he included this M/F flag as a per-line input. Rather than break this format, I used it in the graph as a hint. Maybe a better option would be to remove this flag from the input Note and use either the calculated relationship or Unknown. Thoughts?

Is there a name for this format? When I looked at a similar CSV list exported another system (FamilyTreeDNA), it had a header line. (“Name,Match Name,Chromosome,Start Location,End Location,Centimorgans,Matching SNPS”)

If this is NOT a custom Gramps SNP list format, maybe the Association type should be the standards name? Or, if the DNA was used as Gramplet flag, maybe the Source could be used to identify the format.