* eval.c (merge_wrap): New static function

(eval_init): Register less as intrinsic.  Retarget merge intrinsic to
merge_wrap for proper argument defaulting which is missing from merge,
and which we don't want to introduce there since internal calls
to merge don't erquire it. Change registration of sort so it has
only one required argument, not two.

* lib.c (less_f): New global variable.
(less_tab): New static array.
(less_tab_init): New static function.
(less): New function.
(sort): Default lessfun argument to the less function.
(obj_init): GC-protect the less_f variable.
Initialize it with a function object made from the less function.
(init): Call less_tab_init.

* lib.h (enum type): New enumeration member MAX_TYPE, an alias
for the largest type.
(less_f, less): Declared.

* txr.1: Documented new less function, and that the lessfun
argument in sort and merge is optional, defaulting to less.

* txr.vim: Regenerated.

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