Add tests for rfft, irfft, hfft, ihfft
Add tests for rfft, irfft, hfft, ihfft

PhE/dask,wiso/dask,clarkfitzg/dask,mrocklin/dask,mraspaud/dask,mraspaud/dask,cowlicks/dask,blaze/dask,dask/dask,pombredanne/dask,clarkfitzg/dask,vikhyat/dask,jcrist/dask,vikhyat/dask,cpcloud/dask,dask/dask,chrisbarber/dask,jakirkham/dask,ContinuumIO/dask,ssanderson/dask,ssanderson/dask,pombredanne/dask,mrocklin/dask,wiso/dask,ContinuumIO/dask,jakirkham/dask,gameduell/dask,PhE/dask,blaze/dask,mikegraham/dask,jcrist/dask