Re-add PR #459: ExecuteDFS (generic depth first search) #505
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This reverts #504, in other words, it adds again the code that was in #459.
Since the code in this PR is buggy (see #487), it was removed from the
master
branch. I do not imagine that this PR itself will ever be merged (at least not as-is), but I have pushed this branch and opened this PR so that we do not lose track of this code.@james-d-mitchell has started PR #499 to try to fix this, which I have taken the liberty of rebasing on top of this branch. When #499 is merged, this PR should then be closed, and the associated branch deleted.