Improve the spline router, e.g., fewer inflection points
This issues is migrated from the wishlist HTML page at https://graphviz.org/doc/todo.html.
Git blame shows this is from 2014:
f987a1aad8 (Emden R. Gansner 2014-04-16 12:16:09 -0400 93) Improve the spline router, e.g., fewer inflection points.