On 5.2, Jeff Davis changed the last parameter in the search service contract to be a list of package_ids to restrict to (instead of "date to" since it was never used). Right now, this is used to limit searching per subsite, but it should be possible to limit to one package instance.
On HEAD we are replacing the service contracts with callbacks that also can support a list of package_ids.
Dirk and I developed for Sloanspace, a user interface that offers 3 options, search within one package, one community (could be a subsite), or everything the searcher can read. This work is also on HEAD. It needs testing for Postgresql still.
