relax SVN archive

Updated the relax API documentation at http://www.nmr-relax.com/api/4.0/ to version 4.0.2.

Added some more user function renaming redirects.

Updated the relax HTML manual at http://www.nmr-relax.com/manual/index.html to version 4.0.2.

Updated the http://www.nmr-relax.com/download.html webpage for the relax 4.0.2 release.

Backported the relax 4.0.2 CHANGES file changes to trunk.

The command used was:
svn merge -r28211:28212 svn+ssh://bugman@.../svn/relax/tags/4.0.2 .

Updated the CHANGES file for relax 4.0.2.

Added the relax 4.0.2 manual to the repository.

Updated the version number to relax 4.0.2.

relax version 4.0.2.

This is a minor feature and bugfix release. The new user functions system.cd and system.pwd have
been added to allow the working directory to be changed and displayed. The time and sys_info user
functions have been renamed to system.time and system.sys_info. The structure.delete_ss user
function has been created to remove the helix and sheet information from the internal structural
object. For bugs, the 'R2eff' dispersion model can now handle missing peaks in subsets of spectra,
and the structure.read_pdb can now handle multiple structures and multiple models with the merge
flag set.

Mac OS X fixes for the Structure.test_pca and Structure.test_pca_observers system tests.

The eigenvectors on this OS are sometimes inverted. As the sign of the eigenvector is irrelevant,
the vectors hardcoded into the system tests are now inverted as required.