pov 1.1.1.3: simplify "Can find path from nodes other than x" #536
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This was the main change in exercism/problem-specifications#704
exercism/problem-specifications#710 is an inconsequential
change that does not affect our tests.
Two other changes in 1.1.0 that aren't exactly followed:
into the test data, but we have no need to do it - let's reduce
duplication, and besides we are safe from accidental mutation.
cousins, but we would have had to introduce another tree to do that
(one with kids and siblings). We'll stick with cousins.