- making cft_b_omp thread safe, all threads now initialize their own private FFTW PLAN.
  This parallelization is supported only for internal FFTW.
  It can be extended to other libraries supporting thread nesting, not sure if MKL/FFTW3 can do it.



git-svn-id: http://qeforge.qe-forge.org/svn/q-e/trunk/espresso@11133 c92efa57-630b-4861-b058-cf58834340f0