psql: Make temporary editor files have .sql extension

This gives editors a better chance to treat these files as the SQL
files that they are.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/b6f9834a9e8dfab1bd503ec0357bb812a18018a2

Modified Files
--------------
src/bin/psql/command.c |    4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)

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	Subject: pgsql: Add some weasel wording about threaded usage of PGresults.