Message4740

I was trying to install jython 2.5 rc3 and after doing jar xvf, I
realized that it does not have a root directory. This is painful and a
fix will be simple enough to create the installer with a root directory
name so that when someone installs it it does not pollute the install
directory and installs everything in to something like jython-2.5rc3. 

I also wonder on the choice of packaging as a jar. Would zip packaging
not be simpler?