Should MorphIO warn when child's first point does not equal parent's last point?

[asanin-epfl]

When sanitize/removeUnifurcations was disabled on morphology reading, some checks besides unifurcation were disabled as well. It happened because WARNING_WRONG_DUPLICATE happened on sanitize and it checked for multiple edge cases.

For example, this file does not give any warning now, however the child does not continue the parent.

    with tmp_asc_file('''
                     ((Dendrite)
                      (3 -4 0 5)
                      (3 -10 0 5)
                      (
                        (5 -10 0 10)
                        (0 -10 0 2)
                      )
                      )
                     ''') as tmp_file:
        Morphology(tmp_file.name)

This file does not trigger any warning as well, however axon root points do not equal their parent soma points.

1 1 1 0 1 4.0 -1
2 1 2 0 0 4.0 1
3 1 3 0 0 4.0 2
4 2 4 4 4 4    1  # branch from 'start' of soma
5 2 5 5 5 5    2  # branch from 'middle' of soma
6 2 6 6 6 6    3  # branch from 'end' of soma

cc @tomdele