pgsql: Remove from TODO ability to edit pg_hba.conf, but add GRANT

Log Message:
-----------
Remove from TODO ability to edit pg_hba.conf, but add GRANT connection
permission item:

< o %Allow pg_hba.conf settings to be controlled via SQL
> o %Allow per-database permissions to be set via GRANT
< This would add a function to load the SQL table from
< pg_hba.conf, and one to writes its contents to the flat file.
< The table should have a line number that is a float so rows
< can be inserted between existing rows, e.g. row 2.5 goes
< between row 2 and row 3.
> Allow database connection checks based on GRANT rules in
> addition to the existing access checks in pg_hba.conf.

Modified Files:
--------------
pgsql/doc:
TODO (r1.1800 -> r1.1801)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO.diff?r1=1.1800&r2=1.1801)
pgsql/doc/src/FAQ:
TODO.html (r1.304 -> r1.305)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html.diff?r1=1.304&r2=1.305)