done problem set 3!

modified:   ../../env/.aspell.en.pws
modified:   ../TODO.txt
modified:   basicStatMechProblemSet3Problem1.tex
modified:   basicStatMechProblemSet3Problem2.tex
renamed:    faceCenteredCubicFig1.png -> problemSet2Problem2faceCenteredCubicFig4.png
new file:   problemSet3problem2touchingCirclesFig3.png
modified:   renumber
modified:   statMechProblemSet3.nb
modified:   ../myrefs.bib.in
modified:   ../phy452/renumber