relax SVN archive

Generating new user function 'read_xyz()'.

This is Han's patch https://gna.org/task/download.php?file_id=13153 attached to the task
http://gna.org/task/?7404.

The user function 'read_xyz()' was generated and modified in the generic_fns/structure/main.py based
on the function 'read_pdb()'.

The add_mf_models() method is now using add_static_text() for the text.

The model-free model buttons now expand to the correct width.

Completely refactored the model-free model buttons code.

Removed references to the repository line 1.2 from the download page
(http://www.nmr-relax.com/download.html).

This follows a message by Edward at:
https://mail.gna.org/public/relax-devel/2011-06/msg00115.html
Message-id: <BANLkTikUSnMKJaOivCPwtB55P3QaEDry=Q@...>

Added a reference to the update of the repository code using 'svn up'.

Corrected an error in the html code.

-> Line 124, Column 9: end tag for element "tr" which is not open

This was pointed out by the W3C Markup Validation Service (http://validator.w3.org).

Added a section for the source code repository in the download page.

This follows a message by Edward at:
https://mail.gna.org/public/relax-devel/2011-06/msg00078.html
Message-id: <BANLkTimq=4vfngu+u2WBAuTTsS0nMW+B4A@...>

Added a stretchable spacer to the NOE window so the execute relax button is always at the bottom right.

The peak list grid GUI element now expands within the box it is given.