relax SVN archive

The Mf.test_write_results system test now checks for the ancient PyXML.

This ancient version from 2004 which should be eliminated, if installed, causes the toprettyxml()
changes in Python 2.7.3 to be overridden.

The XML system information print out now uses the dep_check module XML data.

Added the xml module import tests to the dep_check module.

This also adds some code to differentiate between the ancient and dead PyXML which should be
eliminated for Python 2.7.3 onwards and the Python internal XML module.

Improved the XML module system information print out.

The relax system information print out now includes information about the XML modules.

Added an initial but far from complete bmrb.citation user function page and menu element.

This user function will require a new type of wizard element to handle the list of authors!

Added the BMRB icon in various sizes to the graphics directory and icon paths.

Updated all the BMRB user function front ends to the modern docstring design.

Edit of the 'Add' button help in the relaxation data GUI element.

Created a special Bruker add icon for use in the relaxation data GUI element.