Fixes for the Relax_disp.test_hansen_cpmg_data_auto_analysis* system tests.
The Relax_disp.test_hansen_cpmg_data_auto_analysis system test needed updating due to the more
accurate R2eff errors. The Relax_disp.test_hansen_cpmg_data_auto_analysis_r2eff system test also
needed this change. It also no longer has a spin system for residue 4.
