Dag traverse updates

Sebastian Müllerrequested to merge
dag_traverse_updates into main

Add methods to dag type:

  • n_roots: number of roots (i.e. sinks)
  • n_leaves: number of leaves (i.e. headwaters)
  • roots: all root ids
  • leaves: all leave ids

The traverse method now starts at leaves when traversing down and at roots otherwise.

Edited by Sebastian Müller

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