Revert "Fix formats for RNAseq export (TMART-289)"

This reverts commit 32c9314e05b456d9f8c593cfd2e8c4f664d558aa.
Revert "Fix export for RNAseq (TMART-289)"

This reverts commit 87279411ce72d95925b7d36d70a066bde860320c.
Send export parameters as JSON instead of underscore separated string (TMART-318)
Merge pull request #77 from charlotte-raillere/Issue_TMART_318

Issue tmart 318