relax SVN archive

Second attempt at fixing the problem described at r16578.

Bug fix for the Desc_container.add_*() methods - the lists, prompts, and tables sometimes fail.

If there is no text in front of these elements, the checks fail.

Converted all of the OpenDX user functions to the new Desc_container design.

This tests out the use of 'additional' outside documentation.

Renamed a section in the user function class prompt help string.

Improved the user function class prompt help string.

The user function list now uses bold text, and the user function title is also now given.

The prompt help string for user function classes now includes info about the member user functions.

The Uf_info.uf_loop() method can now restrict the looping over a given user function class.

Large improvements to the prompt help strings for the user function classes.

These are now formatted with section using bold text.

The user function default args prompt help string text is now wrapped.

Removed the starting newline from the user function prompt help string.