relax SVN archive

Reverted r14437 as _sys_exit is necessary for the mpi4py processor module.

The command used was:
svn merge -r14437:14436 .

Some cleaning up of the mpi4py processor module.

Reverted r14438 as the code actually was used.

The command used was:
svn merge -r14438:14437 .

Removed a pile of unused code from the mpi4py processor module.

Removed the _sys_exit module variable from the mpi4py processor.

This is unnecessary.

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.