tree.py: implemented collect_neuron_ids and collect_skeleton_ids which do so with recursive calls to find neurons, and the latter picks all skeletons from all neurons found.
tree.py: implemented collect_neuron_ids and collect_skeleton_ids
which do so with recursive calls to find neurons, and the latter
picks all skeletons from all neurons found.

fzadow/CATMAID,fzadow/CATMAID,fzadow/CATMAID,fzadow/CATMAID,htem/CATMAID,htem/CATMAID,htem/CATMAID,htem/CATMAID