Documentation bug in RGSpace?
The docstring for RGSpace says that "only even numbers of grid points per axis are supported": https://gitlab.mpcdf.mpg.de/ift/NIFTy/blob/master/nifty/spaces/rg_space/rg_space.py#L76
However there are no checks in the sources that enforce this constraint. In fact, some tests explicitly specify odd grid dimensions.
So I think that this line should be removed.