stdsuite testing remp2, oo, dfcc (#375)

* refs: qchem occ, mrcc a-(t), occ (not dfocc) olccd grad. also, make stdsuite fn-like.

* dfocc refs non-oo, non-fno

* dfocc oo values -- suspect

* stdsuite ref: occd vals with tighter combo-diis from dfocc

* stdsuite ref: olccd vals with tighter combo-diis from dfocc and conv fc from p4n

* stdsuite refs for CCSD, CCSD(T), A-CCSD(T) with combo-diis convergence in dfocc

* stdsuite ref: occd(t) and a-occd(t) from dfocc

* stdsuite ref: remp, omp2, omp2.5, omp3, oremp from occ/dfocc

* avert numpy on str error. REMP -> REMP2

* format

* excuse lccd for olccd. format