* Fixed doctest failures caused by reorganization of model_grid.py.
* Fixed doctest failures caused by reorganization of model_grid.py.



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