rdrobust (Rust port)

This is a derivative Rust reimplementation of rdrobust, the regression-discontinuity
package by Sebastian Calonico, Matias D. Cattaneo, Max H. Farrell, and Rocio Titiunik.
It reimplements the numerical core in Rust and is distributed under the same license,
the GNU General Public License, version 3 (GPL-3.0-only). See ./LICENSE for the full
text and ./AUTHORS for attribution.

Upstream project: https://github.com/rdpackages/rdrobust
