relax SVN archive

Reverted r13165 as this change could break other part of the relax.

The command used was:
svn merge -r 13165:13164

The changing of the user functions "load_spins" and "add_item" could break other part of relax. This was pointed out by Edward in the email: https://mail.gna.org/public/relax-devel/2011-06/msg00226.html.

Fix for the wizard display_page() method - the call to on_display() was not to the page.

Renamed all of the wizard panels to pages.

Created the wizard page base methods on_display(), on_exit() and on_next().

These will be used to perform actions when a page is newly displayed, exited, or the next page is
jumped to.

The page index is now stored in the page class object instead of being returned by add_page().

The page index is now returned by the wizard add_page() method.

The name of the data pipe is now taken as the analysis type followed by the local date and time.

This is in the new analysis window.

Fix for the wizard panel initialisations. The top level wizard object is now stored in the panel class.

The analysis type is now stored in the wizard class so that the second page can use it.

The new analysis name is now also stored and restored from the relax data store and hence savefiles.