Update tests for entrypoints

test/contracts/basic_auth.aes

@@ -2,9 +2,9 @@
 contract BasicAuth =
   record state = { nonce : int, owner : address }
 
-  function init() = { nonce = 1, owner = Call.caller }
+  entrypoint init() = { nonce = 1, owner = Call.caller }
 
-  stateful function authorize(n : int, s : signature) : bool =
+  stateful entrypoint authorize(n : int, s : signature) : bool =
     require(n >= state.nonce, "Nonce too low")
     require(n =< state.nonce, "Nonce too high")
     put(state{ nonce = n + 1 })
@@ -12,6 +12,6 @@ contract BasicAuth =
       None          => abort("Not in Auth context")
       Some(tx_hash) => Crypto.ecverify(to_sign(tx_hash, n), state.owner, s)
 
-  function to_sign(h : hash, n : int) =
+  entrypoint to_sign(h : hash, n : int) =
     Crypto.blake2b((h, n))