Add schemes (#71)

* Move br + cbt to schemes/tfhe

* refactor blind rotation

* refactor circuit bootstrapping

* renamed exec -> prepared

core/src/layouts/lwe_pt.rs

@@ -1,3 +1,5 @@
+use std::fmt;
+
 use backend::hal::layouts::{Data, DataMut, DataRef, VecZnx, VecZnxToMut, VecZnxToRef};
 
 use crate::layouts::{Infos, SetMetaData};
@@ -18,6 +20,18 @@ impl LWEPlaintext<Vec<u8>> {
     }
 }
 
+impl<D: DataRef> fmt::Display for LWEPlaintext<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "LWEPlaintext: basek={} k={}: {}",
+            self.basek(),
+            self.k(),
+            self.data
+        )
+    }
+}
+
 impl<D: Data> Infos for LWEPlaintext<D> {
     type Inner = VecZnx<D>;