* helm-aliases.el: Fix functions to ignore already bound aliases.
* helm.el (helm-kill-async-process): Kill filter directly.
* helm.el: Remove unused var.
New attr no-matchplugin to disable match-plugin from sources.
* helm-grep.el: use it
* helm-match-plugin.el: use it
* helm-regexp.el: use it.
* helm-elisp.el: Remove one empty line.