* helm-dabbrev.el (helm-dabbrev--collect): Rename lambda fn to search-and-store.
* helm.el (helm-update-blacklist-regexps): Add .*
(helm-set-case-fold-search-1): New.
(helm-set-case-fold-search): Use it.
* helm.el (helm-candidate-number-limit): Allow setting to nil from custom ui.