relax SVN archive

The command used was:
svn merge -r2830:2833 svn+ssh://bugman@.../svn/relax/1.3

These changes to the relax user manual include an update to the core design diagram and three flow
diagrams describing the steps of model-free analysis (the technique of Mandel et al., 1995, using
AIC model selection and model elimination, and the new model-free optimisation protocol of
'full_analysis.py'.