relax SVN archive

Converted all of the alignment tensor user functions to the new Desc_container design.

Itemised lists and verbatim text are now formatted properly for the prompt help strings.

Converted align_tensor.init to the Desc_container object design to test itemised lists.

The Desc_container object now supports itemised lists.

Lists are now formatted for the prompt uf help strings from the Desc_container objects.

Converted the align_tensor.display user function to the new Desc_container design.

This is to test out the list generation.

The Desc_container.add_list_element() method now groups list elements together.

Converted the prompt user function objects to use the new Desc_container objects for the help strings.

Started to redesign the user function definition descriptions.

The desc object has been converted into a list which will contain instances of the new
Desc_container class. This class will hold the description information as blocks of text, including
unformatted paragraphs, verbatim text, lists, tables, and relax prompt examples. The object has a
number of methods used for inputting all of the information, as well as extracting it.

The information in the Desc_container object is not formatted, for example tables will be stored as
lists of lists. This will remove the need for parsing list, tables, verbatim text, etc. by the
docs.latex.fetch_docstrings module. But these will need to be recreated for the prompt help
strings, for the GUI user function descriptions, and for the user manual.

Converted the align_tensor.copy user function description to the new design.

This is a test for the implementation of the description abstraction through the Desc_container
objects. The 'desc', 'additional', and 'prompt examples' will all be merged into one 'desc'
structure.