relax SVN archive

Converted a number of add_verbatim() calls to add_item_list_element() with items of None.

This allows for proper formatting and indentation of equations. In the future, a possible
add_equation() method might be added to provide text and LaTeX representations of equations in the
user function documentation.

Itemised lists without items are now supported in the prompt help strings.

This is to mimic the LaTeX behaviour to allow lists with no 'bullets'.

Shifted the prompt examples to the end of the description for the value.display user function.

A few modules which should have been committed at r16589!

Converted all of the user functions to use the Desc_container class design.

All of the user function descriptions, prompt examples, and additional documentation scattered
around the relax sources have been merged into the Uf_info.desc list of Desc_container objects.

This large set of changes currently breaks the GUI and is not compatible with the user manual
compilation, but should simplify and speed up both of these once converted.

Fix for the Test_uf_objects.test_uf_object_build_doc() unit test.

The deleted 'prompt_examples' and 'description' variables are not passed into the prompt user
function objects.

The 'prompt_examples' and 'additional' uf structures are no longer passed into the prompt objects.

Removed the 'prompt_examples' and 'additional' variables from the Uf_info containers.

These have been superseded by the Desc_container objects.

Prompt examples are now followed by 2 newlines in the prompt help strings.

This restores much of the original formatting for these examples.

Added support for no spacing in tables for the prompt help strings.

The Desc_container.add_table_titles() method now accepts and stores the 'spacing' arg. This is
passed all the way into the prompt help system to format the tables with.