relax SVN archive

Fix for the duplicate title finding script - the LaTeX and HTML mode alternatives are no longer mixed up.

Improvements to the duplicate user manual title finding script.

Created a simple shell script to find duplicate titles in the relax user manual.

This is important for the HTML version of the manual as duplicated titles causes HTML pages to be
overwritten. For example all chapters, sections and subsections titled "Introduction" will load the
introduction.html file which will contain the text of the last section with that title!

Additions to the scripting section of the relaxation curve-fitting chapter of the user manual.

A small edit to the intro chapter for the multi-processor operation and logging.

Added some labelling to the infrastructure chapter of the user manual for referencing.

A number of updates and edits to the intro chapter of the user manual.

The model-free GUI screenshot has been shifted to the intro chapter in preparation for a full
tutorial with screenshots in the model-free chapter.

Updated the data model chapter of the user manual to cover the handling of protons.

This change includes the modification of the PDB reading screenshot to demonstrate the reading of a
specific model and the naming of the molecule.

All of the GUI strings and text are now formatted with a small sans serif font in the user manual.

This is because in the GUI, a sans serif font is almost always used be default.

Fix for bug #20177 (https://gna.org/bugs/?20177).

This was simply a lower precision OS/Python/numpy combination causing a test suite failure - there
are no practical effects and only the precision of the system/GUI test has been lowered.