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Fix HCTH p=7/6 functional: unconverged SCF for HFC-NH triplet

Igor S. Gerasimov requested to merge foxtran/libxc:Igor/HCTHp76_fix into master

This patch fixes HCTH p=7/6 functional which can not converge SCF for HFC-NH triplet system.

Wavefunction - UHF
Charge - 0
Multiplicity - 3
Basis - MIDI
SCF Solver - DIIS
Grid - 48.590
5
HFC-HN triplet
 H              0.5272060531  -1.6981903162   0.7745734831
 N              0.2139398890  -1.2002485003  -0.0908018321
 C             -0.4937258731  -0.0052493598   0.1881706036
 H             -1.5086084353   0.0318142577  -0.2223596448
 F              0.2289975364   1.1455552686  -0.0745345798

Input file for GAMESS-US is here: https://github.com/gms-bbg/libxc-tests/blob/master/dft-libxc/parallel/default/rdft-HCTH76-gradient.inp

Edited by Igor S. Gerasimov

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