Another suggestion

[Gregory Stark <gsstark@mit.edu>]

Could we add a Date header for the date a package was built in the package and
the Packages file? I think this would be generically useful and I have a
specific purpose in mind. 

My specific idea was to add a feature to dselect/apt to select for update any
package that hadn't been modified in the past N days. That would reduce the
bandwidth needs by only downloading packages that aren't under active rapid
development and waiting for a quiescent period when no uploads are needed. 

greg