Correct clippy warnings

Currently intended to be done with:
cargo clippy --features "recommended merlin batch serialize experimental 
ed25519 ristretto p256 secp256k1 multisig" -- -A clippy::type_complexity 
-A dead_code

crypto/frost/src/algorithm.rs

@@ -97,6 +97,12 @@ pub struct Schnorr<C: Curve, H: Hram<C>> {
   _hram: PhantomData<H>,
 }
 
+impl<C: Curve, H: Hram<C>> Default for Schnorr<C, H> {
+  fn default() -> Self {
+    Self::new()
+  }
+}
+
 impl<C: Curve, H: Hram<C>> Schnorr<C, H> {
   pub fn new() -> Schnorr<C, H> {
     Schnorr { transcript: IetfTranscript(vec![]), c: None, _hram: PhantomData }