pgsql: Code review for \df rewrite: fix assorted bugs, make type and

Log Message:
-----------
Code review for \df rewrite: fix assorted bugs, make type and
volatility columns localizable.

Modified Files:
--------------
pgsql/src/bin/psql:
describe.c (r1.211 -> r1.212)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/describe.c?r1=1.211&r2=1.212)