* eval.c (eval_init): not added as synonym for null.

* lib.c (copy_list): Use list_collect_append rather than
list_collect_terminate.
(append2, appendv): Simplified using new list_collect_append.
(nappend2): Simplified using new list_collect_nconc.

* lib.h (list_collect): Added check for accidental usage
of list_collect after list_append, since PTAIL has different
semantics.
(list_collect_nconc, list_collect_append):  Semantics fixed so that
append collecting works more like the Common Lisp append function,
allowing trailing atoms or a lone atom. The meaning of PTAIL is
changed, however.  Now PTAIL actually tracks the head of the most
recently appended segment. Each append operation has to first
traverse the previously added piece to get to the end.

(list_collect_terminate): Macro removed.

* match.c (v_gather): Removed useless use of list_collect_terminate.

* parser.y: Some headers added that are needed by list_collect.

* txr.1: Documented append, list, atom, null, not, consp, make-lazy-cons,
lcons-fun, listp, proper-listp, length-list,  mapcar, mappend, and apply.

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