bug fix: avoid segfault when TAIL_CUTOFF section is not present
merge the case of writing the minimum and integrated FES (now user-controlled with the keyword -integrated_fes)


git-svn-id: svn://svn.code.sf.net/p/cp2k/code/trunk@13242 bac0169d-1eea-4375-b5f6-f89d2ced9994