Regression & unittest fixes

This should fix #116 (regression Gaussian09/BH3_fragment_guess.pop_minimal.log).

I initially wanted also to fix regression Gaussian03/ortho_prod_freq.log but that requires a bit more investigation. That's an ONIOM job, and we need to figure out how to handle those for v1.3 reasonably (currently they break the parse), until we consider parsing fragments (I suppose this qualifies as a specific case).
Are we aware of anything else printed between the alpha and beta set? If there are several more possibilities, something more general would be preferable. This fix for the LZ value analysis is probably ok for the time being.