Removing doubled search results from the grepview plugin

[George Syron]

ok, everything done, but now looking at that nice tree in qgit2 I think I
have accidently committed to master - sorry for that, but my patch seems
very very stable.

another thing: wouldn't it be better to integrate the grep functionality
directly into the plugin instead of using that work-arounds and tweaks etc.
for making the chain work?

-- Syron
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