add optional ContainsHeader property
add optional ContainsHeader property

great we never had this :-(

Change-Id: Id79b08ff9dfe42228ed7d6b27ad0c8cc29b1bfb0

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core