relax SVN archive

Modified the NOE system test to test the usage of Trp indole 15N data.

This is to catch bug #20119 (https://gna.org/bugs/index.php?20119).

Added some Trp peak data (backbone and indole N) to the Sparky steady-state NOE peak lists.

This is in preparation for the modification of the NOE system test to catch bug #20119
(https://gna.org/bugs/index.php?20119).

Modified the NOE sample script to include Trp indole NH data.

Added a step-by-step tutorial for the GUI NOE auto-analysis to the user manual.

This includes 22 screenshots of all the steps!

Added a section label.

Added some Sparky info to the Rx curve-fitting chapter of the user manual.

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.