Slightly clean up the main crate's exports

sigma_compiler_core/src/codegen.rs

@@ -184,7 +184,8 @@ impl CodeGen {
         let group_name = &self.group_name;
 
         let group_types = quote! {
-            pub type Scalar = <super::#group_name as super::Group>::Scalar;
+            use super::group;
+            pub type Scalar = <super::#group_name as group::Group>::Scalar;
             pub type Point = super::#group_name;
         };
 

src/lib.rs

@@ -1,2 +1,3 @@
 pub use sigma_compiler_derive::sigma_compiler;
-pub use group::{self, Group};
+pub use group;
+pub use sigma_rs;