relax SVN archive

Removed all of the xrange() calls from the system tests as these are not necessary.

This is in preparation for Python 3.

Fix for a fatal bug introduced in the last revision (r17576).

Some changes in preparation for Python 3.

Fix for bug #20201 (https://gna.org/bugs/?20201).

The bruker.read user function can now handle the situation where multiple spins per residue are
already loaded prior to the user function call. The isotope value from the DC file is now
translated to the element name and this is used as part of the spin ID string.

Removed the 'force flag' text from the RelaxWarning messages output by the bruker.read user function.

The force flag arguments of the generic_fns.mol_res_spin.name_spin() and
generic_fns.mol_res_spin.set_spin_isotope() functions can now be set to None to suppress the text.

Fixes for the checks in the Mf.test_mf_auto_analysis() GUI test for the recent test suite data changes.

The CSA setting in the model-free auto GUI analysis now defaults to the '@N*' spin ID.

Previously no spin ID was being used so that the protons where also having their CSA values set to
that of the nitrogens. Now the execution checking code skips the proton CSA check.

Added star versions of the standard spin IDs to the spin ID GUI element (e.g. '@N*', '@H*').

Removed some debugging printouts.

Fix for the comment on the 'Export' button in the BMRB export window.