made flow__sink_flag an 8-bit int
made flow__sink_flag an 8-bit int

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