relax SVN archive

Created the page_switch() method and registered it for pipe switches.

The new page_switch() method is registered with the Pipe_switch_observer singleton and observer
object so that pipe switches cause the notebook to switch pages. The switch_page() method has also
been created to abstract the switching of pages in the notebook.

Created generic_fns.pipes.Pipe_switch_observer for observing switches in the current data pipe.

Pipe_switch_observer.notify_observers() is now called by the switch() and delete() functions.

The User_functions class now derives from the Observer base class.

Added a module and base class method Observer which implements the observer design pattern.

Merged revisions 13577 via svnmerge from
svn+ssh://bugman@.../svn/relax/1.3

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r13577 | bugman | 2011-07-13 11:44:38 +0200 (Wed, 13 Jul 2011) | 5 lines

Many bug fixes for the functions of the generic_fns.mol_res_spin module.

These fixes are for when a data pipe other than the current data pipe is used.
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Many bug fixes for the functions of the generic_fns.mol_res_spin module.

These fixes are for when a data pipe other than the current data pipe is used.

Better handling for the failure of auto analysis page setup.

This should now be more logical and appear to do nothing if failure occurs.

The data pipes in the auto NOE, R1 and R2 analysis pages are now only created if they don't exist.

Missing import of protected_exec().

The data pipe creation in the auto NOE, R1 and R2 analysis pages is now protected.

This creation is at the start, prior to data initialisation, so that if errors occur, no analysis
page data is created.