Handle domains over arrays like plain arrays in PL/python.

Domains over arrays are now converted to/from python lists when passed as
arguments or return values. Like regular arrays.

This has some potential to break applications that rely on the old behavior
that they are passed as strings, but in practice there probably aren't many
such applications out there.

Rodolfo Campero
ECPG: Make the preprocessor emit ';' if the variable type for a list of
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>
ECPG: Free the malloc()'ed variables in the test so it comes out clean on
Valgrind runs.

Patch by Boszormenyi Zoltan <zb@cybertec.at>
ECPG: Add EXEC SQL CLOSE C to the tests.

Patch by Boszormenyi Zoltan <zb@cybertec.at>
ECPG: Simplify free_variable()

Patch by Boszormenyi Zoltan <zb@cybertec.at>
ECPG: Fix offset to NULL/size indicator array.

Patch by Boszormenyi Zoltan <zb@cybertec.at>
Oops, forgot to "git add" last minute changes to regression test.
doc: Add id to index in XSLT build

That way, the HTML file name of the index will be the same as currently
for the DSSSL build.
Implement information_schema.parameters.parameter_default column

Reviewed-by: Ali Dar <ali.munir.dar@gmail.com>
Reviewed-by: Amit Khandekar <amit.khandekar@enterprisedb.com>
Reviewed-by: Rodolfo Campero <rodolfo.campero@anachronics.com>
Fix typo in release note.

Backpatch to 9.1.

Josh Kupershmidt
Add --xlogdir option to pg_basebackup, for specifying the pg_xlog directory.

Haribabu kommi, slightly modified by me.
ECPG: Fix searching for quoted cursor names case-sensitively.

Patch by Böszörményi Zoltán <zb@cybertec.at>
Documentation fix for ecpg.

The latest fixes removed a limitation that was still in the docs, so Zoltan updated the docs, too.
Don't update relfrozenxid if any pages were skipped.

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.
Fix plpython3 expected output.

I neglected this in the previous commit that updated the plpython2 output,
which I forgot to "git add" earlier.

As pointed out by Rodolfo Campero and Marko Kreen.