Changed return array to flat numpy array of ints.
Changed return array to flat numpy array of ints.

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