Plot Kinetics tool gives wrong results with no thermo

[mliu49]

One of the main functions of the plot kinetics tool is to fit reverse rates for reactions. It does this using thermo data provided in the Chemkin input file. However, if no thermo data is provided, the tool will still give a reverse rate, fitted using a default dGrxn of 0.

The issue is that this behavior is non-obvious. The instructions say that the Chemkin file should include kinetics and thermo, but does not clearly state that both are required. Users might assume that the reverse rates would be fitted using group additivity thermo if no thermo is provided.