拓扑解析也完成了，虽然用了一些dirty的方法。

Signed-off-by: facat@lab.com <facat@lab.com>

testHasttable/substation.h

@@ -7,6 +7,7 @@ class Substation:public BasicElementInfo
 public:
     explicit Substation(QObject *parent = 0);
     virtual bool parse(QXmlStreamReader& reader);
+    QString getSubstationMemberOf_Feeder();
 protected:
     virtual bool derivedParse(QXmlStreamReader& reader);
     QString namingDescription;