fix tests
lua_fn_extract_lisp_value
have `lua_to_lisp' remove the item begin converted
add luamacs dir to lisp load path
fix index
setup metatables
function: lua_lisp_table_p
basic comparison
__index method for vector references
extract the lisp object when converting from lua
__len method for vectors, rename: lua_cons__len -> lua__len
tests for lua references to lisp vectors
__pairs method for vector references
lua version number
save reference count