render the sequences from the mussa analysis

render the sequences from the mussa analysis
I implemented a GlSequence which attempts to handle the opengl rendering
for a sequence object. Also to make Sequence a bit more consistent
with STL I changed len() to length() and added size() (and changed
the code using it to size()

I added some unit tests for GlSequence as I was not remotely confident
that const_cast was actually the right way to implement the assignment
operator= when one of the member variables is a const reference.

The updateAnalysis code currently is what is handling the layout of the
various sequence objects.