Revert "Changed default graphite time aligner"

This reverts commit f45f5c386f4f20d21aa862e880230cb467c457b5.
Revert "Change time aligner fallback"

This reverts commit 11398156d5683e528c93eeca98db60f5413a458c.
Revert "Changed the default summarizer to floor_time()"

This reverts commit 98128c8c2c15a579b7f456770ef1576496641cd7.