relax SVN archive

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.

Removed a recursive call to wx.Yield in the spin viewer window as this is fatal on Mac OS X!

The Rx spectra list wizard now uses the on_init() wizard page method for the page updates.

This prevents the values in the pages being reset when the apply button is clicked.

Created the GUI wizard page method on_init().

This is executed each time a wizard page is newly displayed.

Fixes for the spectrum.replicated user function GUI page for when the apply button is hit.

The spectrum IDs were continually appended to the ID boxes, so the lists could get quite long.

Fix for the model-free model changing question dialog in the dauvergne_protocol analysis.

The dialog is now larger to see all text, and the answer is no longer back to front.