Added --doctests flag for testing script.
Added --doctests flag for testing script.

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