BUG:  Minor tweeks necessary to allow Autoworkup to complete

During the run of Jatin's predict data for RestingState, and
TRACKOn Freesurfer 5.3 re-run on the helium cluster
from the 20130601 software package build, these issues
needed to be resolved.
BUG: Fix template building when # sessions change

When the number of session change for a FS run, then you need to re-run the
template and longitudinal sessions.  This code now checks for and implements
the freesurfer changes.
ENH: Remove default empty string from optional inputs.
ENH: Update SEMTools definitions.