pgsql: Add: > > o Prevent tab completion of SET TRANSACTION from

Log Message:
-----------
Add:

o Prevent tab completion of SET TRANSACTION from querying the
database and therefore preventing the transaction isolation
level from being set.

Currently, SET <tab> causes a database lookup to check all
supported session variables. This query causes problems
because setting the transaction isolation level must be the
first statement of a transaction.

Modified Files:
--------------
pgsql/doc:
TODO (r1.1752 -> r1.1753)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO.diff?r1=1.1752&amp;r2=1.1753)
pgsql/doc/src/FAQ:
TODO.html (r1.257 -> r1.258)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html.diff?r1=1.257&amp;r2=1.258)