Added doctest for sort_spokes_at_hub, remap.
Added doctest for sort_spokes_at_hub, remap.

landlab/landlab,landlab/landlab,csherwood-usgs/landlab,laijingtao/landlab,ManuSchmi88/landlab,RondaStrauch/landlab,cmshobe/landlab,cmshobe/landlab,Carralex/landlab,landlab/landlab,RondaStrauch/landlab,RondaStrauch/landlab,Carralex/landlab,cmshobe/landlab,csherwood-usgs/landlab,amandersillinois/landlab,Carralex/landlab,amandersillinois/landlab,laijingtao/landlab,ManuSchmi88/landlab,ManuSchmi88/landlab