* packages/vlf/vlf.el: Version 0.4.
(vlf-mode-map): Add bindings to search and jump to BOF/EOF.
(vlf-format-buffer-name): Change position into a percentage.
(vlf-next-batch, vlf-prev-batch): Keep stable cursor position when moving
through chunks.
(vlf-move-to-chunk, vlf-insert-file): New functions.
(vlf): Use them. Disable undo information. Change arg order.
(dired-vlf): Adjust call.
(vlf-re-search-forward, vlf-re-search-backward, vlf-end-search): New functions.