Fieldmap series.

Still not get FSL to work with our fieldmap data.  Don't know what's the problem.  I'll look into it later.  :-(

http://www.fmrib.ox.ac.uk/fsl/fugue/feat_fieldmap.html

http://www.fmrib.ox.ac.uk/fsl/fugue/prelude.html

http://www.fmrib.ox.ac.uk/fsl/fugue/index.html