* helm-imenu.el: Issue #401 recurse also in props.
(helm-imenu-get-prop): new.
(helm-imenu-transformer): use it.
* helm-imenu.el (helm-imenu--get-prop): rename with internal prefix.
* helm-imenu.el (helm-imenu-transformer): Use helm-imenu-delimiter.
* helm-imenu.el (helm-imenu--get-prop): Add comments.
* doc/Home.mdpp: update.
* helm.el (helm-prevent-switching-other-window): Fix docstring.