The functions in ccHistStuff.py are srequired,
therefore ccHistStuff.py is included in the tgz file
For exercise 1 and 3 we need the straightTracks.txt file
For exercise 2 we need the dataSet.npy file
For exercise 2 we need fitAnExponential.py
For exercise 3 we need fit2DTracksConstrained.py 

Exercise 1
------------
linux> ./fitTracks_v1.py

Exercise 2
----------
linux> ./fitDataset.py

Exercise 3
----------
linux> ./fitTracks_v2.py
As a bonus this also plot the chisquared probability
which ideally should be flat between 0 and 1...It is flattish but
not terribly so.

