make use of read_term in the repl

src/prolog/mod.rs

@@ -16,9 +16,9 @@ mod debray_allocator;
 mod fixtures;
 mod heap_iter;
 mod indexing;
-pub mod io;
+pub mod write;
 mod iterators;
 mod or_stack;
 pub mod heap_print;
 mod targets;
-mod read;
+pub mod read;