Cleaned up looped_cell_neighbors.
Cleaned up looped_cell_neighbors.

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