Support non-first column IDs... or something.

[mccalluc]

Shannon writes:

We have started appending the final column as gene names as researchers tend to struggle with the Ensembl Gene Identifiers, which they end up having to google or search for to understand which gene they are looking at. Can we do something where if the column is labeled "external_gene_name", it gets ignored? or used as the identifier?

Chuck:

I don’t want to hard-code too much if this is just an in-house thing… but I could imagine a flag like --id_column that our particular launcher could use to specify an alternate ID column? Or just ignored, as you suggest.