relax SVN archive

Fix for the http://www.nmr-relax.com/download.html page.

This was found by the W3C validator (http://validator.w3.org).

HTML fix for the & character in the http://www.nmr-relax.com pages' side menu.

Updated the alt tags of the http://www.nmr-relax.com/screenshots.html images.

This is for better search engine optimisation (SEO).

Added some epydoc @attention fields to the multi-processor API.

Created the fetch_data_store() multi-processor API function.

This simply returns the data store of the same processor as the calling code. The 2nd test
implementation now uses this code path.

Alphabetical ordering of methods.

The 2nd test implementation's slave command now uses the fetch_data() API function.

This is to obtain the invariant data pre-sent by the master to the slaves.

Renamed the multi-processor API data_fetch() function to fetch_data(), and implemented it.

Renamed data_upload() to send_data_to_slaves() and made it more specific.

The rank argument has been dropped, and now the API function and Processor methods are used solely
for transferring data from the master to all slave processors.

The multi-processor data_fetch() API function is now used to obtain the total_length variable.