Started working on this, but did not get very far.  Keeping it local for now.

Signed-off-by: David Brainard <brainard@psych.upenn.edu>
Started work on these conversion routines and a test program.

Signed-off-by: David Brainard <brainard@psych.upenn.edu>
Added new conversion routines to Contents.m

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