Consolidate generation of releasezipball.

The current releasezipball assembly is a first attempt of generation a zipball similar to the original zip produced with Ant. A number of further improvements should be done here:

• Any unnecessary files made obsolete by the NAS refactoring should be removed-
• All files in the root unclassified dir should be moved into the releasezipball module
• We should be able to remove the archivedatabasedir dir.