Q-Chem: Important fix for all jobs that run via OpenMP.

I'm not perfectly pleased that this involves removing an assert, but
considering that most real-world jobs are run with OpenMP threads...
Q-Chem: the non-specific MPn section was tripped up on a SOS-CIS(D0) job

The Moller-Plesset and coupled cluster sections will benefit from a
very specific, explicit (line-slicing) rewrite.