refactor to actual modules

src/prolog/mod.rs

@@ -2,24 +2,20 @@ extern crate num;
 extern crate ordered_float;
 extern crate prolog_parser;
 
-#[macro_use] pub mod instructions;
-pub mod heap;
-mod and_stack;
+pub mod instructions;
+mod clause_types;
 #[macro_use] mod macros;
 #[macro_use] mod allocator;
-pub mod toplevel;
+mod fixtures;
 pub mod machine;
-pub mod compile;
+mod forms;
 mod arithmetic;
 mod codegen;
-mod copier;
 mod debray_allocator;
-mod fixtures;
 mod heap_iter;
 mod indexing;
 pub mod write;
 mod iterators;
-mod or_stack;
 pub mod heap_print;
 mod targets;
 pub mod read;