add non-allocating enumerate_paths! #428
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This PR adds an in-place version of
enumerate_paths-enumerate_paths!, thatenumerate_pathsnow calls itself after making the required allocations.This can greatly improve performance where you need to call it many times. I also removed allocations in
enumerate_pathsfunctions, such as allocations ofVector{Int}whereUnitRangeworks fine in its place.(This may need a specific test, although it will run in the current tests anyway - I can write that if its considered to be merged)