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Improve Homogeneous1D dealiasing efficiency

Douglas Serson requested to merge feature/Dealiasing-efficiency into master

This MR optimizes the homogeneous dealiasing, mostly by eliminating many redundant Fourier transformations (42 regular and 12 padded per time step, if I am not mistaken...).

This also implements the case with both homogeneous and spectral/hp dealiasing.

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