in progress commit

- added vars to lib
- fixed adders and getters to both vtable and ftable
- made function operations a dual type (enum)
- prototyped calling of stored external ASTs with
arguments (additional operation type
- stub for eval
- added index function to Cell

src/lib.rs

@@ -19,10 +19,12 @@ mod cell;
 mod lex;
 mod func;
 mod eval;
+mod vars;
 
 pub mod ast {
     pub use crate::cell::{Cell, Ctr, cons, cell_as_string};
     pub use crate::lex::{lex};
     pub use crate::func::{Function, Operation, FTable};
+    pub use crate::vars::VTable;
     pub use crate::eval::{eval};
 }