Enhancement: Allow export of genesets to various file formats (.csv, .gmt, etc.)

[ravila4]

GMT (Gene Matrix Transposed) files is a standard format used by gene set enrichment analysis software such as GSEA.

The GMT format is tab-delimited with one geneset per row containing: geneset name, followed by a description, then a list of tab-separated gene IDS:

Name (tab) Description (tab) Gene (tab) Gene (tab)

Perhaps it would be useful for users to be able to export gene sets in this format with their identifiers of choice.

[ravila4]

Other potentially useful formats are:

• .csv
• .xml
• .json
• .txt
• .gmx

[ravila4]

This feature is addressed on the frontend in this PR: https://github.com/biothings/mygeneset.info-website/pull/21

On the backend, Biothings allows response formatting in several file formats: json, yaml, html, msgpack (code) Example: http://mygeneset.info/v1/query?q=_id:GO_0004568_9606&format=yaml

However, writing custom formatters for csv, tsv, and gmt file formats would likely be very specific to mygeneset, and not apply to the other biothings APIs.

[ravila4]

This is already implemented in the frontend. I don't think we have plans to do so in the backend.