relax SVN archive

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.

Converted the calc, grid_search and minimise user function descriptions to use Desc_container.

Tables in the user function descriptions are now formatted for the prompt help strings.

This is for the Desc_container objects. The list of lists are now converted to the text format
originally used for the user function docstrings such as:

__________________________________________________________________________
| | |
| Minimisation algorithm | Patterns |
|________________________|_______________________________________________|
| | |
| Simplex | '^[Ss]implex$' |
| | |
| Levenberg-Marquardt | '^[Ll][Mm]$' or '^[Ll]evenburg-[Mm]arquardt$' |
|________________________|_______________________________________________|