用CIMExporter分别处理读到的线路，开关，变压器等元件。

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

testHasttable/element/branch.h

@@ -1,10 +1,12 @@
 #ifndef BRANCH_H
 #define BRANCH_H
+#include <QObject>
 #include <QString>
-class Branch
+class Branch:public QObject
 {
+    Q_OBJECT
 public:
-    Branch(const QString& from, const QString& to);
+    Branch(const QString& from, const QString& to,QObject* parent=0);
 protected:
     double r;
     double x;