relax SVN archive

Fix for the loading of global data from the mfout file.

This only happens when a global model is optimised. The parameters and chi2 value are in the mfout
file but are fixed or the sum of individual chi2 vals.

Removed a debugging print out.

The global chi2 and tm value are now extracted from the mfout file.

Added checks for the global chi2 and tm value.

Fixes for the checks of the final mfout reading.

Added some checks for the final mfout file.

Fixes for the checks of the test_palmer() system test.

Fix for the Modelfree4 controlling sample script.

This matches the fixes of r7652.

Fix for the extraction of mfout file data in the Modelfree4 system test.

Fixes for the relax data store singleton 'add()', 'to_xml()', and 'from_xml()' methods.

These were referring to the contents of the singleton as self, whereas in reality with the current
temporary implementation it is stored in self.instance. Hence the singleton wasn't operating on
itself.