relax SVN archive

Molecular dynamics by NMR data analysis

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Improved the error message system for the spin ID matching multiple spins

This is a partial response to bug #19717 (http://gna.org/bugs/?19717) reported by Martin Ballaschk
(http://gna.org/users/mab).

Authored by: bugman 2012-05-09

changed	/1.3/generic_fns/mol_res_spin.py
changed	/1.3/relax_errors.py