Final incorportation of problem set 4.  update version for next post.

modified:   ../TODO.txt
modified:   ../myrefs.bib.in
modified:   GNUmakefile
modified:   basicStatMechProblemSet4.tex
modified:   basicStatMechProblemSet4Problem1.tex
modified:   basicStatMechProblemSet4Problem2.tex
modified:   basicStatMechProblemSet4Problem3.tex
modified:   classicthesis-config.tex
new file:   energyProbabilityPathriaQuestion.tex