Implement macros.

Lisp::String for strings while numbers are plain scalars.  This might
also be an Lisp::Reader option.

Pretty-Printer version of Lisp::Printer::print

Reading (a b . c) should work, also (a . nil)

Complete binding of perl builtins.

Figure out how to call perl builtins in array context from Lisp.

Tie some symbols to perl variables.  (setq _ 10)

Readonly symbols: t nil

Documentation
