; Minor improvements to timsort

; Minor improvements to timsort

* src/fns.c (sort_list, sort_vector): Improve documentation and
variable names.
(merge): Replace function inorder with direct use of call2.
* src/lisp.h: Remove inorder prototype.
* src/sort.c:
(struct reloc): Document the order field.
(inorder): Uppercase INLINE.
(binarysort): Move type declaration.
(needmem): New INLINE function.
(merge_lo, merge_hi): Use it.
(merge_getmem): Remove unnecessary if.
(tim_sort): Remove unnecessary if.
(reverse_vector): Shift instead of integer divide by 2.