* bltinmodule.c: removed exec() built-in function.

* Grammar: add exec statement; allow testlist in expr statement.
* ceval.c, compile.c, opcode.h: support exec statement;
  avoid optimizing locals when it is used
* fileobject.{c,h}: add getfilename() internal function.

Objects/fileobject.c

@@ -51,6 +51,16 @@ getfilefile(f)
 		return ((fileobject *)f)->f_fp;
 }
 
+object *
+getfilename(f)
+	object *f;
+{
+	if (f == NULL || !is_fileobject(f))
+		return NULL;
+	else
+		return ((fileobject *)f)->f_name;
+}
+
 object *
 newopenfileobject(fp, name, mode, close)
 	FILE *fp;