1.修复了一些类的isTerminal没有被初始化的bug

2.修复了一些地方判断下一个Terminal的bug
Signed-off-by: facat@lab.com <facat@lab.com>

testHasttable/aclinesegment.h

@@ -6,10 +6,12 @@ class ACLineSegment:public BasicElementInfo
 public:
     explicit ACLineSegment(QObject *parent = 0);
     virtual bool parse(QXmlStreamReader &reader);
+    QString getTerminalA();
+    QString getTerminalB();
 protected:
-    QStringRef terminalA;
-    QStringRef terminalB;
-    QStringRef containsOfSubstation;
+    QString terminalA;
+    QString terminalB;
+    QString containsOfSubstation;
     virtual bool derivedParse(QXmlStreamReader &reader);
 private:
     bool isTerminalA;