Added new function flatten_jagged_array.
Added new function flatten_jagged_array.

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