relax SVN archive

Changed the instance arg to model_index in the model-free set_selected_sim() method.

Fix for the set_selected_sim() method, the args were back to front.

Fixed a call to minimise.reset_min_stats().

Bug fix, removed a now non-existent reference to 'self'.

Converted the generic_fns.value.read() function to the new design.

Converted the read() class method into a module function.

This completes the conversion of all class methods to functions.

Modified the write_data() function to use write_header() and write_line() from generic_fns.sequence.

Modified write_header() to write extra columns as well.

Added the ability to have extra columns written by write_line().

Changed a variable name to avoid confusion.

This is in response to a post by Edward d'Auvergne at:
https://mail.gna.org/public/relax-devel/2008-08/msg00011.html (message ID:
7f080ed10808010103o2bc3db69r385daf7fc8c168d2@...).