Add at_grid fields as numpy scalars.
Add at_grid fields as numpy scalars.

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