relax SVN archive

Updated the relax HTML manual at http://www.nmr-relax.com/manual/index.html to version 4.0.3.

Updated the http://www.nmr-relax.com/download.html webpage for the relax 4.0.3 release.

Backported the relax 4.0.3 CHANGES file changes to trunk.

The command used was:
svn merge -r28265:28266 svn+ssh://bugman@.../svn/relax/tags/4.0.3 .

Updated the CHANGES file for relax 4.0.3.

Added the relax 4.0.3 manual to the repository.

Updated the version number to relax 4.0.3.

relax version 4.0.3.

This is a minor feature and bugfix release. The structure.rmsd user function can now calculate
per-atom RMSDs, structure superimposition is now orders of magnitude faster, the relax deployment
scripts have been improved and expanded to cover other GNU/Linux systems, OpenMPI system testing
scripts have been added, and the relax information printout has been improved. Bugfixes include
that the structure.rmsd user function now correctly calculates the RMSD value, and the inversion
recovery relaxation curve-fitting equations are now correct.

Added support in the information printout for Windows versions of the 'file' program.

This enables the C modules to be identified as 32 or 64-bit, if the 'file' program is installed.

Windows scons C module compilation now defaults to 32-bit.

This is because the default Python downloads are 32-bit. And many libraries (e.g. numpy and scipy)
are only pre-compiled as 32-bit. Hence a 64-bit relax build on Windows will require a lot of custom
compilation that most users will never do.

Added the MPI version information to the mpi4py information printout.