Edits to Thermo estimation unit tests.

1) removed a bug causing an error,
2) split the aromatic species into a separate set of tests.

The non-aromatic tests all pass EXCEPT for cyclopenta-1,3-diene
C1C=CC=C1 which seems to be giving different thermo now.
I am not sure why, or where the original "correct" numbers came from.
Have our ring corrections changed?

The aromatic tests fail because we read in the species via a SMILES string
and in the process Kekulize them. Probably if we specified them via adjacency
lists we would do OK, but for now I will leave these as failing tests until we
properly fix aromaticity detection.
Tweak the thermo database unit tests.

Split the symmetry numbers into separate tests.
Change the error messages.
Update measure to use TransportData instead of LennardJones

Hope this all still works right... Not sure how to run Measure as 
stand-alone.