0afe103269
This finally allows us to use Random factor to add variations to the interpolated children. This feature never worked since 2007L there was random factor slider in the interface, but it was only used by simple children. Now it has affect on interpolated children as well. Technically, this will break compatibility if older file had random factor set to something else than 0 (default value is 0 though). But we are leaving 2.7 series, so can accept such breackage in the name of supported features.