Fix for File dirty on lacing change

Fix for File dirty on lacing change
Fix for File dirty on lacing change

Fix for File dirty on lacing change
Fix for lacing file dirty change

Fix for lacing file dirty change
Fix for file dirty on lacing change

Fix for file dirty on lacing change
Merge pull request #3181 from Benglin/Revit2015

Cross merging master changes into Revit 2015