Updated mappers with out keyword and docstrings.
Updated mappers with out keyword and docstrings.

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