Cache _node_active_inlink_matrix2, _node_active_outlink_matrix2.
Cache _node_active_inlink_matrix2, _node_active_outlink_matrix2.

Ensure node and link status is uint8 everywhere.

Cache _node_active_inlink_matrix2 and _node_active_outlink_matrix2
arrays and reset them when status_at_node changes. This is only
temporary as these arrays will be removed in the near future.

amandersillinois/landlab,cmshobe/landlab,landlab/landlab,landlab/landlab,cmshobe/landlab,landlab/landlab,amandersillinois/landlab,cmshobe/landlab