Requests: Enhancements to DESeq2 csv outputs and PDF outputs

[dshechter]

Description of feature

As discussed on slack, it would be great if the output DESeq2 csv differential files could have both gene_id and gene_name (or Symbol or whatever) included. Right now, only the gene_id is included. We'll have to add back the Name/Symbol for clarity and ease of distribution.

Also, it would be good to output PDFs instead of, or in addition to, pngs for the various graphic files.

Finally, setting the maximum number of annotations, or give a text file of genes to annotate, in volcano plots would help readability.

Thanks