Use correct indices for Phi4 in SCP calculation.
Use correct indices for Phi4 in SCP calculation.

The definition of Phi4 (Fmat in SCP) should be
Phi4(-qi,qj,q'k,-q'l) instead of Phi4(qi,-qj,q'k,-q'l).
This error is reported by Mr. Ryota Masuki (Univ. Tokyo.).

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