move fft package inside of pw


git-svn-id: svn://svn.code.sf.net/p/cp2k/code/trunk@13869 bac0169d-1eea-4375-b5f6-f89d2ced9994
update package plan


git-svn-id: svn://svn.code.sf.net/p/cp2k/code/trunk@13870 bac0169d-1eea-4375-b5f6-f89d2ced9994