option to transpose output

[jmcalabr]

for future reference for seekr functions that output a matrix -- would be useful to be able to transpose output (switch row and column IDs)

[Jessime]

This functionality can also be a one-liner directly from the command-line:

❯ python -c 'import pandas as pd; pd.read_csv("in.csv", index_col=0).T.to_csv("out.csv")'