relax SVN archive

The command used was:
svn merge -r18462:r18461 .

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r18462 | bugman | 2013-02-13 16:05:19 +0100 (Wed, 13 Feb 2013) | 3 lines
Changed paths:
M /trunk/test_suite/system_tests/mol_res_spin.py

Created the Mol_res_spin.test_metadata_molecule_rename system test to demonstrate a spin ID metadata bug.
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