qaqc - add option for user to enter ambient atmospheric CO2

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14. The function ffi_qaqc does not seem to be working properly. (1) There is no summary of the distribution, mean, and outliers of the computed fluxes; (2) There are two plots showing a comparison of linear vs robust linear and linear vs polynomial, but these plots do not show any label indicating which Plot corresponds to each data point on the graphs. I was expecting these plots to look like the ones shown in Figure 4, but they don’t; (3) There is no plot looking like Figure 5; (4) There is no option to input an expected atmospheric gas concentration. Here is an example of how one of the plots looked like for me: