Add new detrended columns to Measurements table

[SCO]

I think this can be done; just don't remember how..  I would like to create a new column in the Measurements table that shows rel_flux_T1 and rel_flux_err_T1 after all detrending parameters have been applied.

[karenacollins]

Click on the "New Col" icon on the left side of the corresponding row in Multi-Plot Y-data.