Backpatch to 8.2.X for new initdbs.

match the postgresql.conf file.  Also add units to descriptions that
lacked them.  Wording improvements.  Mention pg_settings.unit as the way
to find the default units for setting.

Backpatch to 8.2.X.

Previously, disabled triggers were not displayed any differently than
enabled ones, which was quite misleading. Patch from Brendan Jurd.

representation of equivalence classes of variables.  This is an extensive
rewrite, but it brings a number of benefits:
* planner no longer fails in the presence of "incomplete" operator families
that don't offer operators for every possible combination of datatypes.
* avoid generating and then discarding redundant equality clauses.
* remove bogus assumption that derived equalities always use operators
named "=".
* mergejoins can work with a variety of sort orders (e.g., descending) now,
instead of tying each mergejoinable operator to exactly one sort order.
* better recognition of redundant sort columns.
* can make use of equalities appearing underneath an outer join.

currentMarkData from IndexScanDesc to the opaque structs for the
AMs that need this information (currently gist and hash).

Patch from Heikki Linnakangas, fixes by Neil Conway.

rather than a value too high.

HTML in HTML mode. Patch from Jeremy Drake.

Backpatch to 8.2.

might lead to a previously installed libpq being used instead.  But we
don't actually have to link with libpq here at all, so remove it.

other test code.

function is_log_level_output(), for code clarity.

function xmlagg.

< first.
> first.  There is also a developer's wiki at
> http://developer.postgresql.org.

for its header comment.

> 	o Allow multiple vacuums so large tables do not starve small
> 	  tables
>
> 	  http://archives.postgresql.org/pgsql-general/2007-01/msg00031.php
>
> 	o Improve control of auto-vacuum
>
> 	  http://archives.postgresql.org/pgsql-hackers/2006-12/msg00876.php

"input" and "output" dirs be necessarily present.

* Add Globally/Universally Unique Identifier (GUID/UUID)
>   http://archives.postgresql.org/pgsql-general/2007-01/msg00853.php

with new GUC parameter "xmlbinary" that controls the output encoding, as
per SQL/XML standard.

the generated files, to help Visual C++ to run these tests.  The tests still
pass in VPATH and normal builds.

Patch from Magnus Hagander, editorialized by me.

declarations are ignored and removed, in binary mode they are honored as
specified by the XML standard.

for aggregates.  This is OK for current uses but could burn somebody
someday...

pending fsyncs during DROP DATABASE.  Obviously necessary in hindsight :-(

dependency on the platform's floating point implementation. Per
report from Stefan Kaltenbrunner.

is deleted.  A backend about to unlink a file now sends a "revoke fsync"
request to the bgwriter to make it clean out pending fsync requests.  There
is still a race condition where the bgwriter may try to fsync after the unlink
has happened, but we can resolve that by rechecking the fsync request queue
to see if a revoke request arrived meanwhile.  This eliminates the former
kluge of "just assuming" that an ENOENT failure is okay, and lets us handle
the fact that on Windows it might be EACCES too without introducing any
questionable assumptions.  After an idea of mine improved by Magnus.

The HEAD patch doesn't apply cleanly to 8.2, but I'll see about a back-port
later.  In the meantime this could do with some testing on Windows; I've been
able to force it through the code path via ENOENT, but that doesn't prove that
it actually fixes the Windows problem ...

* After Markos patch, now builds pgcrypto without zlib again
* Updates README with xml info
* xml requires xslt and iconv
* disable unnecessary warning about __cdecl()
* Add a buildenv.bat called from all other bat files to set up things
like PATH for flex/bison. (Can't just set it before calling, doesn't
always work when building from the GUI)

The implementation is somewhat ugly logic-wise, but I don't see an
easy way to make it more concise.

When writing this, I noticed that my previous implementation of
width_bucket() doesn't handle NaN correctly:

    postgres=# select width_bucket('NaN', 1, 5, 5);
     width_bucket
    --------------
                6
    (1 row)

AFAICS SQL:2003 does not define a NaN value, so it doesn't address how
width_bucket() should behave here. The patch changes width_bucket() so
that ereport(ERROR) is raised if NaN is specified for the operand or the
lower or upper bounds to width_bucket(). For float8, NaN is disallowed
for any of the floating-point inputs, and +/- infinity is disallowed
for the histogram bounds (but allowed for the operand).

Update docs and regression tests, bump the catversion.

existing TODO items, and re-add a TODO item for an "estimated
count" capability.

it was checking a pg_constraint OID instead of pg_class OID, resulting in
"relation with OID nnnnn does not exist" failures for anyone who wasn't
owner of the table being examined.  Per bug #2848 from Laurence Rowe.

Note: for existing 8.2 installations a simple version update won't fix this;
the easiest fix is to CREATE OR REPLACE this view with the corrected
definition.

accessing it, like DROP DATABASE.  This allows the regression tests to pass
with autovacuum enabled, which open the gates for finally enabling autovacuum
by default.

roles and tablespaces, no longer users and groups. Per Dave Page.

Backport to 8.2 and 8.1.

Slightly reworked patch from Tatsuo Ishii