Deprecate floating point timestamps.

Over in the "Keeping pg_recvlogical's "feTimestamp" separate from
TimestampTz"...

On 2/17/17 12:15 PM, Tom Lane wrote:
> I am not sure that it was really a good design to pretend that the
> replication protocol is independent of --disable-integer-datetimes
> when the underlying WAL stream most certainly isn't.

Ok, I'll open the can of worms...

- Should replication be changed to obey --disable-integer-datetimes?
- Should we consider formally deprecating FP timestamps, starting with
no longer supporting SR?

While #2 may sound rather severe, I'm wondering if a different datatype
for timestamps stored as floats would ease that pain.
--
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
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