[mpnc] fix source of compiler error
Most likely, the complex interdependencies of MPNC and NonEquilibrium type tags and Indices classes yield the compiler error with clang. Provide a temporary fix by not using the NumEq property directly.
Most likely, the complex interdependencies of MPNC and NonEquilibrium type tags and Indices classes yield the compiler error with clang. Provide a temporary fix by not using the NumEq property directly.