[BUG] smearer tests are failing when using numpy 1.25 or later

[jonbarker68]

clarity/evaluator/msbg/smearing.py tests failing with numpy 1.25 or later.

Tracked it down to the smear3 function in smearing.py which computes power by multiply complex number by its conjugate, which should give a real result but in the newer numpy there are precision errors.

Solution is to use np.abs to get the length and then square it. In smear3() the function needs to look like this.

    mag = np.abs(spectrum[0:nyquist])
    phasor = spectrum[0:nyquist] / (mag + (mag == 0))

    smeared = np.dot(f_smear, (mag**2).astype(complex))

With this it passes the tests with all numpy versions, i.e. 1.24 or 1.25