Ability to "view record at some point in the past"

[ajpires]

Another one of ODR's originally promised abilities, I think...all the data should still be in the database. In theory, this is just a matter of reconstructing how the cached_dataype/datarecord/theme arrays would have looked at that point in time...but since the deletedAt columns can't be used, the updated/created columns don't have indexes, and php is going to have to do the filtering, this process could end up being slow...