* packages/vlf/vlf.el: Use lexical-binding. Bump version to 0.3.
Add ability to view newly added content if the file has grown meanwhile.
Provide a V binding in dired.
(vlf-mode-map): Change C-+ to M-+. Add M-- binding.
(vlf-next-batch, vlf-prev-batch): Add ability to jump/insert given number of
batches at once.
(vlf): Add autoload cookie. Add option to start viewing from the end of file.
(dired-vlf): New function.
(vlf-if-file-too-large): New function.
(abort-if-file-too-large): Use it to provide vlf as an option when opening
large files.