Request for review: Grepview plugin rewrite

[Syron]

> We really don't need 2 regexp engines for find-in-files and an option to
> choose between them. We as developers should select one that suits our
> needs. So far I've seen no compelling reason for pcre, but at least 1
> downside (besides the new dependency for us).

I see. Changed all to use QRegExp again now, but for some reason
gitorious doesn't let me push my changes at the moment.
-- Syron