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Since t_0 = log(k_1), where k_1 is the first mode in the corresponding harmonic
space. k_1 can be smaller than one and therefore t_0 can be any real number.

It is rendered in the docs before domain.shape and as such hard
to understand, because it explains two concepts (shape, MPI data
splitting) at once.

Therefore I added the hint that it is mainly relevant for MPI
and that the docstring of domain.shape explains the shape concept
in general.

changed LogRGSpace.get_k_length_array to something sensible. Slope operator and AMplitude model are now getting the structure of the space from the space