Updated comments for FFTW issue

# System-specific settings

# NOTE: you may need to invoke (by typing or in your .cshrc)

# NOTE: you may need to invoke (by entering in your job-submission script

#  or in your .cshrc file)

#   module load libraries/fftw-2.1.5-openmpi-1.1.2-ofed-intel-9.1

# before building LAMMPS

# before running LAMMPS. 

#

# Additional Note:

# Even when using the OpenMPI build 10.0,

# DO NOT USE: module load libraries/fftw-2.1.5_openmpi-1.2.4_ofed_intel-10.0-f025-c025

# This build of FFTW exhibits fatal memory errors in long runs. 

FFTW = /apps/x86_64/libraries/fftw/openmpi-1.1.2-ofed-intel-9.1/fftw-2.1.5