relax SVN archive

Modified the Sconstruct manual cleaning target to remove the 'relax.out' file.

Split the Sparky and XEasy peak intensity reading functions to allow the easy addition of new types.

Added the model m0 to the sample scripts.

Editing of all chapters of the manual and a few large changes.

The data analysis chapter has been split into four. The new chapters include the NOE chapter, the
relaxation curve-fitting chapter, the model-free chapter, and the reduced spectral density mapping
chapter.

The start of the 'Value, gradient, and Hessian' chapter has been moved into the new model-free
chapter under the section 'Theory'. The material moved includes the chi-squared equation, the
relaxation equations, the transformed relaxation equations, the model-free spectral density
functions, and the Brownian rotational diffusion equations.

Many more places in the text have been indexed.

The text of all chapters has been proofed.

Corrects copywrite notice for test_suite/jw_mapping.py

Corrected copyright assignments for c based maths_fns

Changed the release checklist to say to post the release message to relax-announce at gna.org rather
than relax-users at gna.org.

Spell check of the changes file.

The Sconstruct generation of the distribution files now creates a base directory called
'relax-x.x.x/' where x.x.x is the version number rather than just 'relax/'.

Updated the manual and changed the version number to 1.2.4.