Errorbars for synthetic photometry

[gabrielastro]

A convenient enhancement would be to have the option of computing and displaying errorbars for the synthetic photometry, i.e., using the parameter samples in the database and the synthetic photometry for each. This would let the user check whether and (hopefully show that) the ranges for the derived parameters do give photometry approximately consistent with the data; this is not the case e.g. when the Teff errorbars are 1 K.