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Compilation error when using FML in single precision mode.

When trying to compile the FML-COLA solver in single precision mode (SINGLE_PRECISION_FFTW option in the Makefile), the compilation fails with the error:

~/FML/FML/NBody/NBody.h:1598:80: error: no match for 'operator*' (operand types are 'std::complex<float>' and 'double') 
1598 |                     potential_real.set_fourier_from_index(fourier_index, value * norm_poisson_equation);

The error seems to be fixed by performing a static cast on the double variable norm_poisson_equation in line 1598 of NBody.h

potential_real.set_fourier_from_index(fourier_index, value * static_cast<float>(norm_poisson_equation));

However this fix would be valid only when using the COLA solver in single precision mode, so a more general fix would be preferable.

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