relax SVN archive

Created the user function base class method add_desc() for creating a custom description element.

Added two more fonts to the gui object.

Fix for the word wrapping of the relax_fit.set_doc documentation string.

Fixes for the relax_data user function docstrings and variable descriptions.

The wizard _add_desc() method is no longer private to allow derived classes to format this text.

Converted the minimisation documentation used in the user functions to the new system.

Converted the grace user functions to the new documentation system.

Missing import of _build_doc.

Convert the dx.map() user function documentation to the new design.

Converted the eliminate() user function documentation to the new design.