revert back to regular ints for index arrays for now
revert back to regular ints for index arrays for now

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