pgsql: Add index entries for more functions

Add index entries for more functions

Also, move index entries into the tables, closer to the function description,
for easier editing in the future. Resort some tables to be more alphabetical.
Remove the entries for count, max, min, and sum in the tutorial area, because
that was felt to be confusing.

Thom Brown

Branch
------
master

Details
-------
http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=4fc09ad00c3cc95003a5523d85999da1dd4f9d75

Modified Files
--------------
doc/src/sgml/func.sgml | 1781 ++++++++++++++++++++++++++++++-----------------
doc/src/sgml/query.sgml | 6 -
2 files changed, 1141 insertions(+), 646 deletions(-)