Proposal for a pack200 bundle

[Martin Desruisseaux]

For non-Maven users, it may be convenient to download the whole SIS 
library, including dependencies, as a single JAR file. The pack200 
format is a relatively efficient way to perform that task, but I'm not 
aware of a standard Maven plugin for generating that bundle. I have the 
necessary code that I can port. Is there any object to add one more 
custom Maven plugin in our "sis-build-helper" module for generating a 
pack200 file?

If we generate such file, one open question would be where to put it for 
download. Before SIS release, Jenkins provides a place for snapshots. 
But after SIS release, we may need a better location...

    Martin