* helm-regexp.el: Enable match plugin in (m)occur.
(helm-source-moccur): Remove no-matchplugin and nohighlight.
(helm-m-occur-transformer): Use multi-match arg of helm-grep-highlight-match.
* helm-grep.el (helm-grep-highlight-match): new arg multi-match.
* helm.el (helm-get-candidates): Hide wrong-type-argument error.