Test P-521 (#349)

* Test P-521

* De-duplicate generic calls

* Simplify full test vectors generation

src/tests/mod.rs

@@ -7,6 +7,8 @@
 // licenses.
 
 mod full_test;
+#[rustfmt::skip]
+mod full_test_vectors;
 pub mod mock_rng;
 mod opaque_vectors;
 mod parser;