DST law changes in Argentina, Brazil, Jordan, Libya, Liechtenstein,
Morocco, Palestine.  New timezone abbreviations WIB, WIT, WITA for
Indonesia.

Needed so that timezone data update patches can be cherry-picked
into older branches conveniently.

pg_dumpall's charter is to be able to recreate a database cluster's
contents in a virgin installation, but it was failing to honor that
contract if the cluster had any ALTER DATABASE SET
default_transaction_read_only settings.  By including a SET command
for the connection for each connection opened by pg_dumpall output,
errors are avoided and the source cluster is successfully
recreated.

There was discussion of whether to also set this for the connection
applying pg_dump output, but it was felt that it was both less
appropriate in that context, and far easier to work around.

Backpatch to all supported branches.

Ensure that the invocation command for postgres or pg_ctl runservice
double-quotes the executable's pathname; failure to do this leads to
trouble when the path contains spaces.

Also, ensure that the path ends in ".exe" in both cases and uses
backslashes rather than slashes as directory separators.  The latter issue
is reported to confuse some third-party tools such as Symantec Backup Exec.

Also, rewrite the function to avoid buffer overrun issues by using a
PQExpBuffer instead of a fixed-size static buffer.  Combinations of
very long executable pathnames and very long data directory pathnames
could have caused trouble before, for example.

Back-patch to all active branches, since this code has been like this
for a long while.

Naoya Anzai and Tom Lane, reviewed by Rajeev Rastogi

Vacuum recognizes that it can update relfrozenxid by checking whether it has
processed all pages of a relation. Unfortunately it performed that check
after truncating the dead pages at the end of the relation, and used the new
number of pages to decide whether all pages have been scanned. If the new
number of pages happened to be smaller or equal to the number of pages
scanned, it incorrectly decided that all pages were scanned.

This can lead to relfrozenxid being updated, even though some pages were
skipped that still contain old XIDs. That can lead to data loss due to xid
wraparounds with some rows suddenly missing. This likely has escaped notice
so far because it takes a large number (~2^31) of xids being used to see the
effect, while a full-table vacuum before that would fix the issue.

The incorrect logic was introduced by commit
b4b6923e03f4d29636a94f6f4cc2f5cf6298b8c8. Backpatch this fix down to 8.4,
like that commit.

Andres Freund, with some modifications by me.

variables is varchar. This fixes this test case:

int main(void)
{
    exec sql begin declare section;
    varchar a[50], b[50];
    exec sql end declare section;

    return 0;
}

Since varchars are internally turned into custom structs and
the type name is emitted for these variable declarations,
the preprocessed code previously had:

struct varchar_1  { ... }  a _,_  struct varchar_2  { ... }  b ;

The comma in the generated C file was a syntax error.

There are no regression test changes since it's not exercised.

Patch by Boszormenyi Zoltan <zb@cybertec.at>

Conflicts:
	src/interfaces/ecpg/preproc/ecpg.trailer

Patch by Boszormenyi Zoltan <zb@cybertec.at>