different from those used until now git-svn-id: http://qeforge.qe-forge.org/svn/q-e/trunk/espresso@5098 c92efa57-630b-4861-b058-cf58834340f0
for some tests to get less shaky results (especially for stress) git-svn-id: http://qeforge.qe-forge.org/svn/q-e/trunk/espresso@4193 c92efa57-630b-4861-b058-cf58834340f0