GCP

Input File	Description
gcp/pbeh3c	validate PBEh-3c against the literature
gcp/hf3c	Verify HF-3c method over S22
gcp/hf3c-hessian	HF3C fd and analytical frequency
gcp/dft-custom-hybrid	DFT (hybrids) + GCP test of implementations in: hybrid_superfuncs.py
gcp/hf3c-gradients	HF3C fd and analytical gradient