Merged revisions 21187 via svnmerge from 
svn+ssh://bugman@svn.gna.org/svn/relax/trunk

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  r21187 | bugman | 2013-10-18 20:12:35 +0200 (Fri, 18 Oct 2013) | 5 lines
  
  The test_suite.clean_up.deletion() function can now handle the case of missing files and directories.
  
  This problem was occurring in the relax_disp branch for some of the system tests.
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Elimination of the relaxation dispersion system test tearDown() method.

The functionality is fully covered by the base system test method.
Removed an unused import.