* helm-tags.el (helm-etags-all-tag-files): Remove unused directory arg.
(helm-source-etags-select): Use mapc.
* helm-tags.el (helm-etags-all-tag-files): Use helm-fast-remove-dups instead of delete-dups.
* helm-tags.el (helm-etags-all-tag-files): Also no need to copy-sequence.
* helm-tags.el (helm-etags-select): use  \\_<foo\\_>  as default but allow inserting foo on M-n (second press).
* helm.el (helm-initial-setup): Allow using a list for :default in helm.
* helm.el (helm): Update :default arg doc.
* helm-tags.el (helm-etags-select): clear cache of old tag fiels