Changes

* Fixed the packing out of parameter tex for global analysis in model IT99. Bug #22220 (https://gna.org/bugs/index.php?22220): Unpacking of parameters for global analysis in model IT99, is performed wrong.

* Fix for bug #22257, the freezing of the GUI after using the free file format window on Mac OS X. This is reported at https://gna.org/bugs/?22257. This is a recurring problem in Mac OS X as it cannot be tested in the relax test suite. The problem is with wxPython. The modal dialogs, such as the free file format window, cannot be destroyed on Mac OS X using wx.Dialog.Destroy() - this kills wxPython and hence kills relax. The problem does not exist on any other operating system. To fix this, all wx.Dialog.Destroy() calls have been replaced with wx.Dialog.Close().