relax SVN archive

Fix for the RelaxError system - the status singleton was not being imported.

This was a result of a faulty merger of the gui_testing branch.

Reverted revision 14427, as this was a clear mistake..!

The command used was:
svn merge -r14427:14426 .

Included artificial data for one spin in the "exp_3param_inv_neg" test data files.

Eliminated the restore_stdio() method from the multi package.

The redirection of IO streams is totally incompatible with an IO redirection performed by the
underlying Python program.

Renamed the "exp_3param" test data files in preparation for inclusion of artificial data.

Removed the IO redirection from the uni-processor return_object() method.

IO redirection in the 'multi' package is a bad, bad idea and destroys all IO redirection any Python
program is attempting to do.

Prepared the "exp_3param" test for inclusion of artificial data.

The uni-processor call to capture_stdio() has been removed.

No IO redirection will be performed in uni-processor mode.

Deleted the STDOUT and STDERR capture mess in MF_minimise_command!

This was a horrible design breaking both the GUI and the test suite!!!

Corrected a mistake in the inversion-recovery (exp_3param) equation.

Two signs were inverted...