relax SVN archive

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.

Bug fixes for all of the specific analyses for running Monte Carlo simulations multiple times.

Many of the specific analyses were raising RelaxErrors if simulations had previously been run. Now
this no longer occurs, so that the analysis can be re-run!

Bug fix for the removal of the auto NOE or Rx analyses from the GUI.

The analyses were not being unregistered from the execution lock observer object, so when either the
analysis is closed or a state is loaded, then the dead methods of the old analyses are still being
called by the execution lock observer!