64bit datadescriptors

[Erior]

Not sure this is something we want, but just as reference, here is an implementation to support 64bit descriptors generated by Java ZipOutputStream when we get into > 4G files sizes. It would be good to get TotalIn/TotalOut from the decompression skip and populate compressed size / uncompressed size when we do not know about it, then DataDescriptor can be used for verification (as it is supposed to) and less a guessing game.