Change XCFUN_ACCURATE_PBEX_MU -> XCFUN_REF_PBEX_MU

[stigrj]

It seems the XCFUN_ACCURATE_PBEX_MU parameter that can be activated in src/config.hpp is never used in the code and should be replaced by XCFUN_REF_PBEX_MU. At least the latter triggers the change I'm looking for when comparing with libxc.

How Has This Been Tested?

Helium energy:

• -2.89293549978 (xcfun using default parameters)
• -2.89293486688 (xcfun using #define XCFUN_REF_PBEX_MU)
• -2.89293486679 (libxc)

(#define XCFUN_ACCURATE_PBEX_MU triggers nothing at all, since it does not appear in the source code)

Status

• [x] Ready to go

[codecov-io]

Codecov Report

Merging #75 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #75   +/-   ##
=======================================
  Coverage   43.99%   43.99%           
=======================================
  Files          78       78           
  Lines        1839     1839           
=======================================
  Hits          809      809           
  Misses       1030     1030

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[bast]

Thanks a lot!