relax SVN archive

Modified the pipe.display user function backend to show the pipe bundles.

This required the addition of the generic_fns.pipes.get_bundle() function.

Implemented the pipe.bundle user function, including the full description and the back end.

The data store is_empty() method works again - the pipe_bundles structure is now blacklisted.

Shifted the pipe bundle graphic and created a wizard PNG file for the GUI user function.

Created icons for the pipe bundle concept.

Implemented the generic_fns.pipes.bundle_names() function for returning a list of all pipe bundles.

The pipe.create user function now creates pipe bundles in the back end.

The new ds.pipe_bundles dictionary is used to hold lists of pipes associated with the pipe bundle
name as the dictionary keys. The 'bundle' arg is passed into the ds.add() method for storage.

Added the 'bundle' keyword arg to the pipe.create user function definition.

Preparation for the implementation of pipe bundle concept - addition of system and GUI tests.

This new pipe bundling concept is simply a way of grouping data pipes together. This will be useful
for:

- Grouping and categorisation of data pipes when multiple analyses are performed.

- The model-free dauvergne_protocol auto-analysis will place all the data pipes it creates into one
bundle.

- For the GUI mode, analyses will be linked to pipe bundles rather than data pipes. This will allow
switching data pipes to activate the correct analysis.

The 'verbatim' user function description elements are now properly formatted in the GUI.

These elements now use the font.modern_small formatting to have fixed-width characters.