Adding another closed-form normal test
Change script to use new hakaru github repository
Remove ppaml.mla because it's generated by Maple

To pull new Maple code from github HEAD to ppaml@quarry, say
    runhaskell maple/MapleUpdate.hs
or
    ssh ppaml@quarry.uits.indiana.edu 'cd hakaru/maple && pwd && git pull && maple update-archive.mpl && ls -l ppaml.mla'