* packages/vlf/vlf.el: Version 0.5
Add editing mode. Search refinements.
(vlf-mode-map): Change keys for batch size and EOF/BOF jumps.
(vlf-mode): Move buffer-disable-undo here.
(vlf-move-to-chunk): New function.
(vlf-change-batch-size): Use it to immediately update content.
(vlf-if-file-too-large): Adjust call (missed in last change).
(vlf-re-search, vlf-goto-match): New functions.
(vlf-re-search-forward, vlf-re-search-backward): Use them.
(vlf-end-search): Remove function.
(vlf-edit-mode-map): New var.
(vlf-edit-mode): New major mode.
(vlf-write, vlf-discard-edit): New commands.