relax SVN archive

Bug fix for the relax save states - the current data pipe is now saved and restored.

The info about the cdp was being blacklisted, so was not stored in the relax save file.

Fix for the load_from_store() analysis method - the pipe switching flag is now reset.

Better handling of pipe switching during the loading of a relax state.

The _switch_flag class variable has been introduced as a wx.Notebook.AddPage() call triggers
on_page_change() which will then switch pipes if the current page does not match cdp!

Better handling of the opening of analyses from a saved state.

The tabs are not all switched to as they are created, and only at the end is there a switch to the
page matching the current data pipe.

Only the pages in the sequence have their _apply() methods calls when the wizard finishes.

The _seq_loop() method has been added to provide forward looping over the sequence.

The spectrum.integration_points uf page only appears in the NOE peak intensity wizard if needed.

If heights are used, this page is skipped.

Fix for incorrect text in the spectrum.read_intensities GUI user function page.

Added the noe.spectrum_type user function page to the NOE peak intensity reading wizard.

Implemented the noe user function GUI pages and menu entries.

Improvements to the noe user function documentation.