relax SVN archive

Added a new model-free test set, calculated using the new back_calc.py module.

Created a module to aid in the back-calculation of relaxation data from model-free parameters.

Fix for the removal of all data pipes prior to initial optimisation.

The generic_fns.pipes.get_pipe() function was being used to test if a pipe exists rather than
has_pipe(), causing a RelaxError if the pipe does not already exist.

Added pdf files of two previously presented posters of relax.

1. Presented by Edward at ENC 2009 in Asilomar (USA).
2. Presented by Sebastien at MOOT 2009 in Ottawa (Canada)

This follows a thread at:
https://mail.gna.org/public/relax-devel/2011-01/msg00018.html
(Message-id: <4D2C8D60.9050300@...>)

Change an accent for a special HTML character in http://www.nmr-relax.com/refs.html
and http://www.nmr-relax.com/features.html.

This was pointed by Edward in a post at:
https://mail.gna.org/public/relax-devel/2011-01/msg00021.html
(Message-id: <AANLkTinLpE7RW2K2Rh_sSxVgS-jN4scZjQW6bWP7pUNe@...>)

Corrected a typo ('fi' as one letter) in the reference list at http://www.nmr-relax.com/refs.html.

This was pointed by Edward in a post at:
https://mail.gna.org/public/relax-devel/2011-01/msg00022.html
(Message-id: <AANLkTi=EbM3k0676rh=Mz+BEvP8dypkc1QvReXU3bT=N@...>)

Corrected a typo in the features list at http://www.nmr-relax.com/index.html.

This was pointed by Edward in a post at:
https://mail.gna.org/public/relax-devel/2011-01/msg00023.html
(Message-id: <AANLkTinf2RB2_b2bCkYWPDnFEaRZLH1sLdULmrDLOA=w@...>)

Updated the features list at http://www.nmr-relax.com/index.html to include "Consistency testing".

Updated the features list at http://www.nmr-relax.com/features.html to include "Consistency testing".

Updated the reference list at http://www.nmr-relax.com/refs.html to include "Consistency testing".