Coefficients for PW91 are not implemented #86
Description
The actual values for PW91 can be obtained here, Table S3: https://www.rsc.org/suppdata/c7/cp/c7cp04913g/c7cp04913g1.pdf
s6 = 1.0_wp
a1 = 0.6319_wp
s8 = 1.9598_wp
a2 = 4.5718_wp
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