Replace cycle detection algorithm with Tarjan's strongly connected components algorithm#49

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hedgepigdaniel:refactor/tarjan

Commits on Sep 19, 2019

Refactor to use tarjan's algorithm to improve performance
hedgepigdaniel
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Output all files in cycle even if only some are included, add test enforcing that no warning is generated if all files in a cycle are excluded
hedgepigdaniel
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