Save multiple log-ratio selections before exporting

[mestaki]

It would be super useful if one could export multiple selections out of Qurro.
Ex., currently I select top/bottom 10 features as my log ratios and can export these for stats testing in R (or Python). But if I wanted to export the top 5 ASVs (or some other specific selection) I would lose the first selection and have to create a new export file for each selection. Just feels rather redundant. It would be very convenient if I could save the first selection (with a custom name), then select additional sets and only at the end export them all which would just add the extra columns to the same file instead.