LC: Add begin and end kp and fix the convertion bug.

src/Model/BoundaryCondition/BoundaryCondition.py

@@ -161,7 +161,9 @@ class BoundaryCondition(object):
 
     @timer
     def convert(self, cls):
-        new = cls(name = self.name)
+        new = cls(name = self.name, status = self._status)
+        new.node = self.node
+
         for i, _ in self.data:
             new.add(i)
 
@@ -171,7 +173,6 @@ class BoundaryCondition(object):
                     for ind, v in self.data:
                         new._set_i_c_v(ind, j, v[i])
 
-        self._status.modified()
         return new
 
     def move_up(self, index):