* helm-help.el: update dummy doc.
* helm-apt.el (helm-shell-command-if-needed): Removed.
(helm-apt-cache-show): Move helm-shell-command-if-needed code here, use view.
* helm-apt.el (helm-apt-init): Fix, faster.
* helm-apt.el (helm-apt-candidate-transformer): Allow filtering installed deinstalled and all.
(helm-apt-show-only): New.
* helm-apt.el: Add the command and keymap to filter only de/installed, all.
(helm-apt-show-all, helm-apt-show-only-deinstalled
helm-apt-show-only-installed): commands
(helm-apt-map): map.
* helm-apt.el: Add help command and mode-line to apt.
* helm-config.el: update autoload.
* helm-help.el: Add help string and help command for apt.
* helm-apt.el (helm-apt-query): Removed unused.
* helm-apt.el (helm-apt-candidate-transformer): now a filtered-ct.
Merge pull request #220 from emacs-helm/exp

Exp: Add filter to show only installed, all and deinstalled packages.
* helm-apt.el (helm-apt-generic-action): Don't quote.
* helm-files.el: Don't quote here too.
* helm-locate.el: same
* helm-files.el (helm-find-shell-command-fn): Fix case-fold-search.
* helm-apt.el (helm-apt-show-only-not-installed): Filter not installed.
* helm-help.el: Document it.
* helm-apt.el (helm-apt-candidate-transformer): Fix.