relax SVN archive

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().

Renamed the 'doc_builder' module to 'relax_string'.

This will be used to hold more string related functions used throughout relax.

The status.text_width variable is now used to wrap the user function docstrings.

This is for the prompt help system.

Shifted the prompt ps1, ps2 and ps3 variables into the 'interpreter' module.

This is the only place they are used, so they are better there.

Eliminated the defunct User_fn_class base class.

The Sequence GUI elements now default to not being read-only.

Fix for the pipe editor - this window is now the parent for the user functions it calls.

Therefore the pipe editor no longer disappears behind the main relax window.