sepgsql: One more getObjectIdentity in lieu of getObjectDescription.

KaiGai Kohei, based on a suggestion from Álvaro Herrera
sepgsql: Minor improvement to test script, doc fix.

KaiGai Kohei
pg_upgrade:  Add checksum C comment

We might eventually allow checksum to no-checksum upgrades.
Standardize spelling of "nonblocking"

Only adjusted the user-exposed messages and documentation,  not all
source code comments.
Fix typo in comment.

Fabrízio de Royes Mello
Don't try to pass -I switch to postmaster in contrib/start-scripts/linux.

Undo thinko in commit 87306184580c9c49717b00d48a2f9e717f21e0a8.
Per bug #8098 from Catherine Devlin.
Improve error message when an FDW doesn't support WHERE CURRENT OF.

If an FDW fails to take special measures with a CurrentOfExpr, we will
end up trying to execute it as an ordinary qual, which was being treated
as a purely internal failure condition.  Provide a more user-oriented
error message for such cases.
Clean up references to SQL92

In most cases, these were just references to the SQL standard in
general.  In a few cases, a contrast was made between SQL92 and later
standards -- those have been kept unchanged.
doc: Mention SATA alongside IDE for Linux

suggested by Jov
Publish draft 9.3 release notes

No links added yet.
Push 9.3 release SGML file

Forgotten in previous commit.
Reorder some 9.3 release item entries

More to go.
Fix longstanding race condition in plancache.c.

When creating or manipulating a cached plan for a transaction control
command (particularly ROLLBACK), we must not perform any catalog accesses,
since we might be in an aborted transaction.  However, plancache.c busily
saved or examined the search_path for every cached plan.  If we were
unlucky enough to do this at a moment where the path's expansion into
schema OIDs wasn't already cached, we'd do some catalog accesses; and with
some more bad luck such as an ill-timed signal arrival, that could lead to
crashes or Assert failures, as exhibited in bug #8095 from Nachiket Vaidya.
Fortunately, there's no real need to consider the search path for such
commands, so we can just skip the relevant steps when the subject statement
is a TransactionStmt.  This is somewhat related to bug #5269, though the
failure happens during initial cached-plan creation rather than
revalidation.

This bug has been there since the plan cache was invented, so back-patch
to all supported branches.
Fix Gilles Darold's name in 9.3 release notes.
More 9.3 release note reorderings
Reorder 9.3 release note items

Typo fix from David Fetter.
Adjust 9.3 release notes per request from Simon
9.3 release note fixes

Move commit_delay, fix Zoltan's name, and adjust range type histogram
text.
Remove 9.3 item about fixing DROP INDEX CONCURRENTLY

Already fixed in back branch.
9.3 release note adjustments per request from Andres Freund