Class-A surfacing 2/3: surface match, boundary patch and CV fairing (#1487)

Thanks @midasdf.

crates/doc/src/format/pending/class-a-surfaces.rs

@@ -0,0 +1,5 @@
+//! The Class-A surface pass adds `SurfaceBoundary` (Boundary Surface: `sketch`, `curves`,
+//! optional `orders`, `crown`, `samples`), `SurfaceMatch` (Match Surface: `body`, optional
+//! `faces`, `target`, `edges`, optional `order`) and `SurfaceFair` (Fair Surface: `body`, optional
+//! `faces`, `strength`, `iterations`, `keep_edges`, `tolerance`). Older designs need no
+//! transformation; 0.13.x asks for an update instead of meeting a feature it can't read.