Remove callbacks for dealing with manifests from the AG.
Simply use the stat_dataset() callback for populating the manifest.
Better debugging output for hitting cached dataset stats
Correctly decide the right sequence of publishes, reversions, and deletions to evolve one specfile into another.
Clean up of AG HTTP server, with bugfixes
Give the map_info the query *string*, not query *type*
Improve disk test specfile
Have the UG read manifests and blocks from the AG correctly: don't
always assume the AG knows the size of the file to request.  Needs more
testing.
Delete commented-out code in ms-client.cpp