Re-added CppNumSolvers -- not very performant
Re-added CppNumSolvers -- not very performant


Former-commit-id: 2e90342491f8b5ebe99cb001c6caff974ce72d17
DavidAce/DMRG,DavidAce/DMRG,DavidAce/DMRG,DavidAce/DMRG