offers to download and install Java if needed (OS X, and Linux with apt-get)
downloads AppleCommander jarfile to /usr/local/bin if not installed
OS X (and probably BSD) compatibility for -ad option
Notably this may cause issues diffing adtpro.sh.txt against the
upstreadm adtpro.sh script. Ours had mixed coding styles, and I figured
having to diff with whitespace ignored was a better solution than
dealing with mixed styles either in the file or in the tree for the
majority of people who aren't likely using the same editor I am.
