* helm-net.el: Add eww browser.
* helm-regexp.el (helm-m-occur-filter-one-by-one): Fix docstring.
* helm-help.el: Improve filter-one-by-one doc.
* helm.el: Improve filter-one-by-one.
(helm-match-from-candidates,
helm-search-from-candidate-buffer): check the hash table.
(helm--accumulate-candidates): filter-one-by-one here, but push the cand in hash before modifying.
* helm-bookmark.el: require bookmark.