Updated GaussianLog unit tests to use V=0 energies.

The unit tests had not been updated since I switched
GaussianLog.loadEnergy() to return the energy at the bottom of the well
(i.e. without ZPE).
GaussianLog can actually read G3 energies.

There was an indexing error caused by the lack of space between "G3" and "(0
K)". I've also added a unit test like I should have the first time, so this
actually works now.