Replace duplicate_oids with Perl implementation

It is more portable, more robust, and more readable.

From: Andrew Dunstan <andrew@dunslane.net>
Remove maintainer-check target, fold into normal build

make maintainer-check was obscure and rarely called in practice, and
many breakages were missed.  Fold everything that make maintainer-check
used to do into the normal build.  Specifically:

- Call duplicate_oids when genbki.pl is called.

- Check for tabs in SGML files when the documentation is built.

- Run msgfmt with the -c option during the regular build.  Add an
  additional configure check to see whether we are using the GNU
  version.  (make maintainer-check probably used to fail with non-GNU
  msgfmt.)

Keep maintainer-check as around as phony target for the time being in
case anyone is calling it.  But it won't do anything anymore.
doc: Handle additional character entities for SGML/XML conversion
doc: Fix table column number declaration
doc: Move check-tabs target into html target

The previous plan of having the check-tabs target a prerequisite of
"all" and "distprep" caused make distcheck to fail because make -q
distprep would never be satisfied.  Put check-tabs into the html target
instead, so it is only called when a build actually happens.
Rework SSL renegotiation code

The existing renegotiation code was home for several bugs: it might
erroneously report that renegotiation had failed; it might try to
execute another renegotiation while the previous one was pending; it
failed to terminate the connection if the renegotiation never actually
took place; if a renegotiation was started, the byte count was reset,
even if the renegotiation wasn't completed (this isn't good from a
security perspective because it means continuing to use a session that
should be considered compromised due to volume of data transferred.)

The new code is structured to avoid these pitfalls: renegotiation is
started a little earlier than the limit has expired; the handshake
sequence is retried until it has actually returned successfully, and no
more than that, but if it fails too many times, the connection is
closed.  The byte count is reset only when the renegotiation has
succeeded, and if the renegotiation byte count limit expires, the
connection is terminated.

This commit only touches the master branch, because some of the changes
are controversial.  If everything goes well, a back-patch might be
considered.

Per discussion started by message
20130710212017.GB4941@eldon.alvh.no-ip.org
Use $(PERL) to invoke duplicate_oids

Per buildfarm failure reported by smilodon
Fix several possibly non-portable gaffs in record_image_ops.

Sparc machines in the buildfarm were made happy by the previous
fix, but PowerPC machines still are still failing.  Hopefully this
will cure that.
Tweak "line" test to avoid platform-specific floating-point output
Add use of asprintf()

Add asprintf(), pg_asprintf(), and psprintf() to simplify string
allocation and composition.  Replacement implementations taken from
NetBSD.

Reviewed-by: Álvaro Herrera <alvherre@2ndquadrant.com>
Reviewed-by: Asif Naeem <anaeem.it@gmail.com>
Attempt to fix MSVC build for asprintf addition
Add asprintf.c

Forgotten in 5b6d08cd2992922b667564a49f19580f11676050
Translation updates to fix build failures

Now that msgfmt is run with -c by default, older versions of gettext are
complaining about the PO headers Last-Translator and Language-Team
still having their default values.  Newer gettext versions fail to catch
this because of a bug (https://savannah.gnu.org/bugs/?40261), which is
why this hasn't been noticed before.

Copy updated versions of affected translation files from the
pgtranslations repository, were those files have been fixed.
Fix details missed by dynamic shared memory patch.

Additional documentation update, and a comment fix.

Both issues reported by Amit Kapila.
In dsm_impl_windows, don't error out when the segment already exists.

This is the behavior of the other implementations, and the behavior
expected by the callers of this function.

Amit Kapila
docs: correct 9.1 and 9.2 release note mention of timeline switch fix

Backpatch through 9.1.

KONDO Mitsumasa
doc: Enable book index in XSLT builds

The XSLT toolchain requires an empty <index> element where the index is
supposed to appear.  Add that with conditionals to hide it from the
DSSSL build.
Switch order of -lpgport and -lpgcommon

Conceptually, libpgcommon can depend on libpgport, but not the other way
around.  In the past, this might not have mattered, but it's needed now
for asprintf.
initdb: Suppress dynamic shared memory when probing for max_connections.

This might not be the right long-term solution here, but it will
hopefully turn the buildfarm green again.

Oversight noted by Andres Freund
Allow 5+ digit years for non-ISO timestamp/date strings, where appropriate

Report from Haribabu Kommi