Use new cythonized code for subsiding.
Use new cythonized code for subsiding.

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