rename directory fft_lib into fft

git-svn-id: svn://svn.code.sf.net/p/cp2k/code/trunk@13676 bac0169d-1eea-4375-b5f6-f89d2ced9994
rename directory dbcsr_lib into dbcsr

git-svn-id: svn://svn.code.sf.net/p/cp2k/code/trunk@13677 bac0169d-1eea-4375-b5f6-f89d2ced9994