relax SVN archive

Allowed the raggedbottom LaTeX setting as this is better for the screenshot layout in the user manual.

Bug fix for the reading of Sparky peak lists.

Spin names with numbers at the end were not being correctly identified. This fix allows Trp indole
NE1-HE1 data to be loaded.

Bug fix for the loading of peak intensities via spectrum.read_intensities.

The user function could not be applied twice, preventing the loading of data from different spin
systems such as Trp indole NH data.

Added the nth package for the user manual LaTeX compilation.

The NOE chapter now points to the recommendations in the Rx fitting chapter.

Added a new section called 'From spectra to peak intensities' to the Rx fitting chapter of the manual.

This adds a number of recommendations for high quality relaxation rates.

Added the Viles et al., 2001 reference.

Another fix for the relax_data.temp_control description.

Fix for the incomplete relax_data.temp_control user function description.

Spell fix for the relax_data.temp_calibration user function description.