refactoring and tweaking of gatherer code and usage

- better function names
- get rid of the notion of named forks; just counting them is sufficient
- don't terminate automatically, which results in a more symmetric API
  and allows gatherer reuse
- in the gatherer usage, spawn workers with a thunk rather than MFA,
  which is less cryptic
- use of folds and list comprehensions in queue_index_walker, in
  preference over recursion

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