Updated the relax script for analysing Remco Sprangers' ClpP data with the 'MQ NS 2-site' model.

The error analysis has been removed as it is identical to what the auto-analysis does.
Merged revisions 21025-21026 via svnmerge from 
svn+ssh://bugman@svn.gna.org/svn/relax/trunk

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  r21025 | bugman | 2013-10-09 18:00:30 +0200 (Wed, 09 Oct 2013) | 6 lines
  
  Updated the spectrum.error_analysis user function backend to use the lib.statistics.std() function.
  
  This simplifies the code.  It affects only the peak intensity error analysis when spectra have been
  replicated.
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  r21026 | bugman | 2013-10-09 18:00:57 +0200 (Wed, 09 Oct 2013) | 3 lines
  
  Updated the test suite with slight changes needed due to r21025.
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Renamed the directory of Remco Sprangers' CPMG dispersion data to correctly spell his name.
Updated the script for Remco Sprangers' MQ CPMG data.
Created the Relax_disp.test_sprangers_cpmg_data_auto_analysis system test.

This checks the 'MQ NS 2-site' model against Remco Sprangers' MQ CPMG data using the auto-analysis.