Removed print statements from doctests.
Removed print statements from doctests.

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