Moved what was in opticalImage to the needs filing directory.

Signed-off-by: David Brainard <brainard@psych.upenn.edu>
Put data dir back into isettools

It turns out the location of this is pretty hard coded into more than one place, and right now I don't want to take on changing this.  So I put it back.

Signed-off-by: David Brainard <brainard@psych.upenn.edu>