Updated GTWSPARQLLexer to properly handle backslash escapes in PN_LOCAL.
Updated GTWSimpleQueryEngine to assume all project items are nodes.
Removed implementation for unused SPARQL parser grammar rules.
Changed use of kAlgebraGraph trees to have just the graph node in the treeValue slot.
Removed unused code that was looking for filter expressions attached to kAlgebraGraph trees.
Assume all kAlgebraExtend trees have a child algebra in planning.
Removed test.rq file.