relax SVN archive

All of the user function documentation tables now use the new Uf_tables singleton structure.

The special properties for the colour module tables (longtables and now spacing) have been added as
well.

Fix for the new Uf_tables.add_table() method - the table is now returned.

Created a new way of defining and inputting tables into the user function descriptions.

This introduces the user_functions.objects.Table for holding all the table data and metadata, and
the user_functions.data.Uf_tables singleton object for holding all the tables. This design will
allow more metadata (for example using longtables in the LaTeX user manual) to be specified. The
singleton collection of tables with unique labels will also allow the elimination of duplicated
tables in the PDF and HTML user manuals. The new table title metadata will also be used for the
table headings in the user manuals.

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.