data: increased parse and graph assembly performance

* removed header search in subdirectories of header search paths
* cache file node ids in Storage for faster lookup
* retrieve node names from SearchIndex
* fixed addNodeAndAllChildren also called for member edges
* added check if node already present in addEdgeAndAllChildren

src/lib/data/parser/ParserClient.h

@@ -51,6 +51,9 @@ public:
 	ParserClient();
 	virtual ~ParserClient();
 
+	virtual void startParsing() = 0;
+	virtual void finishParsing() = 0;
+
 	virtual void prepareParsingFile() = 0;
 	virtual void finishParsingFile() = 0;