Example UMS for NIFTI source
Fix: Freesurfer
Minor mod in firstlevel_threshold
Change in structural stream (normalisation)

My previous solution may cause error if more fmri sessions are provided.
Therefore I tried a bit different approach: norm_noss will nomralise the
bias-corrected if available.  In any case structure stream will contain
nomralised and unnormalisied images both either bias-corrected or not
according to the settings. Norm_write uses this structural stream as
input, but does not touch it.