Bug in density Laplacian calculation in nwdft

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Just Got Here
Dear developers,

I've found that the density Laplacian is not computed correctly inside xc_rhogen.F; furthermore, the AO hessian is not updated if pre-screening of grid points is performed in grid_pscreen.F. Perhaps this is the reason for the XDM parameters to be different in NWChem.

I can send you the corrected subroutines.

Daniel Mejia-Rodriguez