IN PROGRESS - issue CORE-4414: Notification Agent: count-message
endpoint is not respecting clock time 
https://pods.iplantcollaborative.org/jira/browse/CORE-4414

A composite was used to create db/count-sys-note-ack-state-below. This
caused the the function with complete millis-since-epoch to only be
called once. This wouldn't normally be an issue, but millis-since-epoch
is referentially opaque.  The composite form is no longer used. Instead,
the parameters are explicitly passed to a manual composition.
Updated /seen endpoint doc with user param

The user parameter is explicitly described in the documentation for the POST /seen endpoint.