pgsql: Have \d show child tables that inherit from the specified parent

Log Message:
-----------
Have \d show child tables that inherit from the specified parent

As per discussion, \d shows only the number of child tables, because that
could be hundreds, when used for partitioning. \d+ shows the actual list.

Author: Damien Clochard <damien@dalibo.info>

Modified Files:
--------------
pgsql/src/bin/psql:
describe.c (r1.218 -> r1.219)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/describe.c?r1=1.218&amp;r2=1.219)