relax SVN archive

Correct formatting of species name (italics).

Added a new section 'Literature' to the features page.

This now covers the 2 JBNMR papers which are the primary reference for relax.

Added my PhD thesis as a reference.

Better spacing in the HTML.

Added a missing comma.

Added the 2 JBNMR optimisation papers to the references.

Converted all the abstract links to DOI links for better link stability.

Added the Horne et al, 2007 reference.

Added the set theory paper to the reference section.

Improved the reference page layout.