fourier: float rawdata overflow problem fixed

The program, fourier, used by the csurf FOURIER button,
was originally designed to read short (2-byte) data (used
by the csurf FOURIER button).

In Apr 2014, fourier was extended to be able to read FLOAT
BRIK's, but it was still reading them into a short buffer.
This could result in overflows with FLOAT BRIK's containing
large (>32768) raw data values.

This has been fixed in the zipped fourier binaries included
in this directory.  After unzipping the appropriate fourier
(mac or linux64), move it to the appropriate locations:

  $CSURF_DIR/bin/Darwin-x86_64
  $CSURF_DIR/bin/Linux-x86_64

moving aside or replacing the older version of fourier.
After installing, the help message resulting from typing
'fourier', should end in:

                                                     version: 08n