Jython wrapper update

I added some basic options using `getopts`.  There is an option `-c` for specifying additional CLASSPATH components your script might require.  Also, if an external script is specified, interactive mode is bypassed and the script is run.

All the initEnv stuff was ripped out, as it was rather confusing.  If it actually works, you can still source `bin/gsh`, so it doesn't need to be in these wrappers anyway.