pgsql: doc: Clean up bibliography rendering for XSLT

doc: Clean up bibliography rendering for XSLT

In the DSSSL stylesheets, we had an extensive customization of the
bibliography rendering. Since the bibliography isn't that used much, it
doesn't seem worth doing an elaborate porting of that to XSLT. So this
just moves some things around, removes some unused things, and does some
minimal XSLT stylesheet customizations to make things look clean.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/d63762452434a3a046e8c7d130d5a77c594176e4

Modified Files
--------------
doc/src/sgml/biblio.sgml | 120 ++++++++++++-----------------------------
doc/src/sgml/stylesheet-fo.xsl | 17 ++++++
doc/src/sgml/stylesheet.xsl | 21 ++++++++
3 files changed, 71 insertions(+), 87 deletions(-)

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