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 The File -> New Spherical Avg menu creates a
 new blank directory to hold a cross-session
 cross-subject spherical average
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This is the first step in making a cross-subject
spherical average.  The structure of the
directory and subdirectories is nearly identical
to that of a functional session directory.
The only difference is that a Spherical Average
directory can only contain one scandir.

When the new spherical average session is made,
it prompts you to find a subject somewhere
that will be used to display the average data.
The subject must exist somewhere.  This linkage
is saved in a file, "name", inside the session
directory containing only the SUBJECTS_DIR
directory name of the subject (e.g., johns).

The display subject can be easily changed later
on the CrossSessTools -> Cross Session Fourier
Average panel.

