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.
More GIN refactoring.

Separate the insertion payload from the more static portions of GinBtree.
GinBtree now only contains information related to searching the tree, and
the information of what to insert is passed separately.

Add root block number to GinBtree, instead of passing it around all the
functions as argument.

Split off ginFinishSplit() from ginInsertValue(). ginFinishSplit is
responsible for finding the parent and inserting the downlink to it.
Get rid of the post-recovery cleanup step of GIN page splits.

Replace it with an approach similar to what GiST uses: when a page is split,
the left sibling is marked with a flag indicating that the parent hasn't been
updated yet. When the parent is updated, the flag is cleared. If an insertion
steps on a page with the flag set, it will finish split before proceeding
with the insertion.

The post-recovery cleanup mechanism was never totally reliable, as insertion
to the parent could fail e.g because of running out of memory or disk space,
leaving the tree in an inconsistent state.

This also divides the responsibility of WAL-logging more clearly between
the generic ginbtree.c code, and the parts specific to entry and posting
trees. There is now a common WAL record format for insertions and deletions,
which is written by ginbtree.c, followed by tree-specific payload, which is
returned by the placetopage- and split- callbacks.