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Merge branch 'sparqlstore-update-context'

Previously, SPARQLStore.update was forwarding the Update to the SPARQL
endpoint unchanged. This had the unexpected consequence that
SPARQLStore.update with a queryGraph affected the default graph instead
of the given queryGraph. In turn, this caused updates on a context of a
ConjunctiveGraph to not affect the given context, but the default graph
instead.

SPARQLUpdateStore now rewrites SPARQL Updates such that the update
modifies only the given context graph. This is done by wrapping the
content of the {}-block of each operation in a `GRAPH <?> { }`-block.
The SPARQL Update is tokenized using a simplified grammar in order to
always correctly inject the GRAPH blocks.

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