Add new functions to mark/unmark/delete all bookmarks

[Matthew White]

Hello,

Attached here there is a patch to add new functions to mark, unmark,
and delete all bookmarks at once.

Menu entries and bindings are updated too, and tests are included.

You may consider this both a suggestion and a way to get an opinion
from the community.

I felt that some functions where missing, I'm used to type "U" in
dired to unmark all marks...

Summary (just main functions are described here):

* bookmark-delete-all: With ARG nil asks for confirmation. Deletes all
  bookmarks. Bound to "D" in `bookmark-map'.
* bookmark-bmenu-mark-all: Operates in the *Bookmark List* buffer.
  Marks all bookmarks. Bound to "M" in `bookmark-bmenu-mode-map'.
* bookmark-bmenu-unmark-all: Operates in the *Bookmark List* buffer.
  Unmarks all bookmarks. Bound to "U" in `bookmark-bmenu-mode-map'.
* bookmark-bmenu-delete-all: Operates in the *Bookmark List* buffer.
  Marks all bookmarks for deletion. Bound to "D" in `bookmark-bmenu-mode-map'.

--

Matthew White <mehw.is.me@inventati.org>

0001-Add-new-functions-to-mark-unmark-delete-all-bookmark.patch
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