the result file which is to be compared will now be deleted at the
beginning of the test to make sure that the latest results file is
compared
fixed typos in fuzzycompare

reviewed by gruenich


git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@13442 2fb0f335-1f38-0410-981e-8018bf24f1b0