- DEFATOMs are moved to a separate file. (atoms.lisp)
- DEFATOMs are moved to a separate file. (atoms.lisp)

- Builtin DEFRULEs are removed. (rm rules.lisp)

- New ATTACHMENT slot introduced to PARSER-CONTEXT class and
  CREATE-PARSER-CONTEXT, DEFRULE functions altered respectively.

- DEFRENDERER macro is introduced.

vy/meta-sexp