[ENH] Pysradb doesn't work on "superseries"

[gdolsten]

If I run "pysradb gsm-to-srp GSE163666", I get no results. But if I run on one of the subseries, GSE165894, it works perfectly. Is there anyway to "traverse" the GEO graph to make sure I am getting all of the subseries/superseries? I am trying to download some data but for some of the GSE IDs I only have one out of several subseries, and I would love to go from that subseries to the superseries to make sure I download all of the data.