* helm-files.el (helm-ff-transform-fname-for-completion): Fix when helm-ff-smart-completion is disabled and handle regexps in mp.
* helm-files.el (helm-ff-transform-fname-for-completion): Simplify.
* helm-grep.el: Add -a option to zgrep and fix helm-zgrep-file-extension-regexp.
* helm-utils.el (helm-basedir): New
* helm-files.el: Use it, add comments.