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Translate group extends back to GROUP BY expressions in toAst (#202)

toAlgebra translates GROUP BY (expr AS ?v) to Extends directly below the Group. toAst now translates those Extends back to (expr AS ?v) group conditions instead of BINDs at the end of WHERE. It only does so for Extends that bind group variables in the order of the group conditions, so semantics are kept. When removing quads, such an Extend bounds the GRAPH, so the group condition is not moved into the GRAPH.

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