* helm-help.el: Fix tip for helm-find-files.
* helm-plugin.el (helm-p-candidates-file-init): Don't use `helm-current-buffer' as candidate buffer.
* helm-buffers.el (helm-buffer-save-and-update): Don't try to unmark when no candidates marked.
(helm-buffer-revert-and-update): same.
* helm-files.el (helm-ff-quick-delete): Handle marked files, simplify.