use adaptive stepping for exact Riemann integration (#2869)

There are 2 main changes here: 1. the riemann_support.H header is now split into 2, one for shocks and one for rarefactions 2. the rarefaction integration no longer uses a fixed stepsize, but instead now does an adaptive RK4 integration This changes results to roundoff / tol error, as expected.
AMReX-Astro · Jun 19, 2024 · 5f48f95 · 5f48f95
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diff --git a/Util/exact_riemann/ci-benchmarks/test1-riemann.out b/Util/exact_riemann/ci-benchmarks/test1-riemann.out