Build 4.0.0.80 of xlsgen fixes 2 memory leaks that were harming the ability to use xlsgen in server scenarios, i.e. loaded with plenty of user requests, or working for hours or even days behind a web server.

Memory leaks are the result of creating many internal data structures meant to compute so much stuff behind the scene and trying to optimize speed. Every now and then there must be a hold and check approach, as long as memory is not kept at regular levels, for making sure it is possible and even wise to keep adding more internal structures. After all, xlsgen is all the complexity of Excel, just without a user interface.