[Nepomuk] Optimizing Metadatamover::removeMetadata()

[Vishesh Handa]

Hi!

The current version is recursive and executes a query for every sub folder.
This version only executes the query once. I haven't done any benchmarking,
but this version should be considerably faster. The second version I've
provided uses a Soprano::BindingSet.

- Vishesh Handa
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