init all fields of sorted array


git-svn-id: svn://svn.code.sf.net/p/cp2k/code/trunk@14728 bac0169d-1eea-4375-b5f6-f89d2ced9994
init mpi'ed buffers to silence warnings under valgrind


git-svn-id: svn://svn.code.sf.net/p/cp2k/code/trunk@14729 bac0169d-1eea-4375-b5f6-f89d2ced9994