[m-rev.] for review: Implement two more transitive closure algorithms.

[Peter Wang]

On Wed, 25 Jan 2023 15:01:24 +1100 Peter Wang <novalazy at gmail.com> wrote:
> 
> You mean tests/benchmarks? I suppose I could move the benchmark code
> currently in tests/hard_coded/digraph_tc.m to a driver program in
> tests/benchmarks.

I don't like the code duplication, though. I'd rather just delete the
code.

Peter