linenoise: major delete ops now yank to clipboard.

* linenoise/linenoise.c (yank): New static function, made out
of yank_sel.
(yank_by_ptr): New static function.
(yank_sel): Now wrapper for yank.
(edit_delete): Call yank_sel here if selmode is on, rather
than having the caller do it. This fixes a bug: the Ctrl-D
handler was doing this, but not the Del key handler.
(edit_delete, edit_delete_prev_all, edit_delete_to_eol,
edit_delete_line): All these operations
now yank the deleted text into the clipboard.
(edit_delete_prev_word): Likewise, and bugfix here: undo was
not being recorded for the clipboard deletion, only for the
word deletion. The semantics here is that if a selection is in
effect, only the selection goes into the clipboard, not the
word.now the deleted selection goes into the clipbo
(edit): Ctrl-D handler now doesn't call yank_sel, relying on
edit_delete to do it.

* txr.1: Documentation updated.

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