Energy tests
Be aware: I changed the interface to the energies. The energy classes do not take the keyword fft anymore. Instead use ht now since we want t encourage users to facilitate the HarmonicTransformOperator from now on.
Be aware: I changed the interface to the energies. The energy classes do not take the keyword fft anymore. Instead use ht now since we want t encourage users to facilitate the HarmonicTransformOperator from now on.