cleanup einsum_tot/ijk_mn_eq_ij_mn_times_kj_mn .. no need for such ve… #954

Job	Run time
macos-latest: clang++ Release Pthreads	42m 0s
macos-latest: clang++ Release PaRSEC	53m 23s
macos-latest: clang++ Debug Pthreads	27m 53s
macos-latest: clang++ Debug PaRSEC	29m 57s
macos-latest: /usr/local/bin/g++-10 Release Pthreads	34m 37s
macos-latest: /usr/local/bin/g++-10 Release PaRSEC	33m 57s
macos-latest: /usr/local/bin/g++-10 Debug Pthreads	38m 28s
macos-latest: /usr/local/bin/g++-10 Debug PaRSEC	32m 44s
	4h 52m 59s

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