relax SVN archive

Converted the Interpreter.script() method into a proper user function.

This pseudo user function was no longer functional after the auto-generation changes.

Removed some junk text.

Redesigned the prompt help system for the auto-generated user functions.

The documentation is closer to the style in the relax manual, including 'Synopsis' and 'Default'
sections (i.e. see http://www.nmr-relax.com/manual/value_set.html).

The _build_doc() method now returns the documentation.

Eliminated the build_doc() function as this is no longer used.

The new auto-generated user functions use a variant of this function as the _build_doc() method.

The uf_docstring functions are no longer private.

Updated the prompt package __all__ list.

Renamed the 'base_class' module to 'uf_docstring'.

This module now only contains functions relating to the auto-generated user function docstrings!

Import fixes.

Shifted the prompt.base_class._strip_lead() fn to relax_string.strip_lead().