defines a flag to include a Fast Fourier Transform routine. This flag does nothing right now except allowing the PPPM class to compile.  ticket #79
defines a flag to include a Fast Fourier Transform routine. This flag does nothing right now except allowing the PPPM class to compile. 
ticket #79


git-svn-id: 4ba210d0a933e3fb1aa9ab096f190cd38965d92a@1273 fa922fa7-2fde-0310-acd8-f43f465a7996

joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue