Clear the frame bookmark after killing the buffers but before deleting
the frame. This prevents the auto-save feature from overwriting an
existing bookmark with the empty buffer list.

* bufferlo.el (bufferlo-delete-frame-kill-buffers): Clear bookmark.

Warn when an active bufferlo bookmark is not present in a
refreshed bookmark list.

* bufferlo.el (bufferlo-mode): Add/remove hook.
(bufferlo--bookmark-after-load-file-hook): Hook implementation.

It can be a float, so it should have type `number` instead of `natnum`.

The previous code used `locate-user-emacs-file` which returns a path
even if the file doesn't exist, causing the `when` condition to
always evaluate to true. This change ensures that `bufferlo-noload`
file existence is properly checked before inhibiting bufferlo
bookmark loading.

See https://github.com/florommel/bufferlo/issues/64

Starting in Emacs 31, 'tab-bar-tab-post-open-functions' are
called for the initial tab on a frame, and prior to
'after-make-frame-functions' when the 'tab-bar' is being set up
during frame initialization.  We ensure that
'bufferlo--tab-include-exclude-buffers' is skipped until
'bufferlo--include-exclude-buffers' is called after the frame is
created, and our curated 'buffer-list' parameter is initialized
for the frame/tab.  Therein after it is safe to call
'bufferlo--tab-include-exclude-buffers' for each subsequent new
tab.  This strategy is safe to use on Emacs < 31.

* bufferlo.el (bufferlo-mode): Add and remove
'bufferlo--tab-include-exclude-buffers-inhibit' on
'before-make-frame-hook'.  Minor rearrangement to make more
logical sense given call flow.
(bufferlo--include-exclude-buffers): Uninhibit the block.
(bufferlo--tab-include-exclude-buffers-inhibit): New defvar.
(bufferlo--tab-include-exclude-buffers-inhibit): New defun to
manage the defvar.
(bufferlo--tab-include-exclude-buffers): Consult
'bufferlo--tab-include-exclude-buffers-inhibit'.

Improve language in desktop.el documentation

Change logic to explicitly test for
bufferlo--bookmark-set-loading and the explicit values of
bufferlo-bookmark-frame-load-make-frame rather than assuming
bufferlo-bookmark-frame-load-make-frame will always be nil while
loading a set.

Add bufferlo-bookmark-frame-load-make-frame
'reuse-restore-geometry to accommodate the case where a user
does not want a new frame but does want to restore a frame
bookmark's geometry.

Update documentation.

This addresses the situation where there are no bufferlo local
buffers and the user has not yet actively selected a buffer
window.  For the sake of completness, both the bufferlo frame
parameter 'buffer-predicate function and
'switch-to-prev-buffer-skip-p' function now treat a passed
buffer as local when 'buffer-list is nil.

- Correct ?b to ?o in the first example.
- Correct "> O" to "> o" (the narrowing keys are lower case).
- Link to the narrowing sections on consult's home page.