* debug.c (debug): Fix regression: repeat last command by hitting

Enter stopped working.  This was broken by recent bugfixes in the
string splitting functions, which introduced a semantics change.

* eval.c (flip_s, vecref_s): New symbol variables.
(op_modplace): New places (vecref ...) and (flip ...). Bugfix: dec
operator was incrementing.
(expand_place): Handle vecref and flip. Bugfix: pop has no
third argument and so is now handled by the same case as flip.
Bugfix: if a modify form has no third argument, then do not
resynthesize it with a nil third argument.
(eval_init): Initialize new symbol variables.
Register new flip operator. Register new list_vectory function
as intrinsic.

* lib.c (rplacd): When modifying the cdr field of a lazy cons,
then lapse the lazy function to nil! This is needed by user-defined
lazy conses, and it makes sense to do it this way rather than
put in some explicit interface.
(list_vector): New function.

* lib.h (list_vector): Declared.

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