relax SVN archive

Bug fix for Mac OS X for the spectrum.replicated GUI user function.

A GetValue() call fails on Mac OS X for a read only wx.ComboBox if no value is set!!! Stupid Mac!

Fix for the Rx auto-analysis GUI test for the changes to the spectrum.replicated user function GUI page.

Another Mac OS X test suite fix - the spin viewer window menu bar is now no longer set in the gui tests.

Bug fix for the test suite under Mac OS X - the GUI's SetMenuBar method is only called if status.show_gui is set.

This prevents the menu bar from starting when running the GUI tests.

Bug fix for Mac OS X - the timer in the relax controller is started with a wx.CallAfter() call.

This is to ensure that it will start from the main thread, which is essential!

The GUI tests in the test suite no longer have IO redirected to a window in Mac OS X and MS Windows!

All wx calls to Show(), ShowModal() and PopupMenu() are now suppressed if the status.show_gui flag is not set.

This is to eliminate problems of GUI elements starting up in the test-suite under Mac OS X!

Fixes for many user function GUI pages for when the apply button is clicked.

The combo box GUI elements were having data appended each time on_display() is called (this happens
with a click on the apply button), but the previous values were not cleared out. This results in
very long repetitive lists.

Deleted the old gui.filedialog.opendir fn and replaced it with a specialised RelaxDirDialog class.

This class is more advanced in that it changes the Python working directory so that the user does
not have to always navigate back to the same place if relax is launched from a different directory.

The RelaxFileDialog object now changes the working directory as the user changes directories.