Removed junk, tidied up plotting, updated entropy

Now periodically re-seeding the random number generator with true
random numbers from Random.org. The short plot is now the only option
for all plots. Fixed meanPlot() to handle confidence intervals and
nicer error bars. Removed code for measuring the structure in the
dynamic and combined sets. Simplified the computation of entropy, added
a function to compute conditional entropy (may not be working properly
yet).