fix outgoing_nodes in hex tectonics
fix outgoing_nodes in hex tectonics

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