How to convert GDSIIData back to the gds file correctly?

[huajielong]

I added a member method, Zeropath2polygon, to GDSIIData. It is used to change the polygon path width. After the modification, I found that there is no function to convert GDSIIData to the new gds file, such as the GDSIIData::WriteGDSIIFile function.