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 The SessionsTools -> View All Scandirs menu
 provides a quick way to browse the entire set of
 scan dirs in the current functional dir.
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Choosing View All Scandirs makes a popup that
contains all the previously configured scandirs
in the current FUNCTIONALS_DIR.  This may take a
second or two.

The scandirs are sorted by subject (with a note
if the subject was not found in the current
SUBJECTS_DIR).  The sessions for each subject are
then arranged alphabetically.

Quick scandir access

Double-clicking a scandir opens the View
Functional Data panel for the session that
contains it, and renders activations onto the
currently selected surface with currently saved
parameters.

If a surfer tools panel is already open, you have
to do two double-clicks on a new scandir to close
the currently rendering (and its surfer tools)
and to open a new one.

Double-clicking a session just opens the the View
Functional Data panel without rendering
anything.
