Fixed bug in reading of scan energies from Gaussian log files.
Fixed bug in reading of scan energies from Gaussian log files.

It turns out that the proper string denoting a successful
optimization is either "Optimization completed." or "Optimization completed
on the basis of negligible forces." We were only catching the former before
this commit.

nyee/RMG-Py,chatelak/RMG-Py,KEHANG/RMG-Py,faribas/RMG-Py,KEHANG/RMG-Py,comocheng/RMG-Py,comocheng/RMG-Py,pierrelb/RMG-Py,faribas/RMG-Py,nyee/RMG-Py,nickvandewiele/RMG-Py,chatelak/RMG-Py,enochd/RMG-Py,enochd/RMG-Py,nickvandewiele/RMG-Py,pierrelb/RMG-Py