small output enhancement


git-svn-id: svn://svn.code.sf.net/p/cp2k/code/trunk@13979 bac0169d-1eea-4375-b5f6-f89d2ced9994
preprettify dirs are now removed upon distclean or prettyclean


git-svn-id: svn://svn.code.sf.net/p/cp2k/code/trunk@13980 bac0169d-1eea-4375-b5f6-f89d2ced9994