pgAdmin III commit: Fix the search query

Fix the search query

It tried to look into the pg_user_mapping catalog. A regular user cannot read
this table, hence a query error when searching objects while connected as a
regular user.

This patch adds a new IsSuperuser() method to the pgConn class. It calls this
method to check if it should add the UNION clause with the SQL/MED tables
(which pg_user_mapping is a part of).

Per a report from Chandrakant G.

Branch
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REL-1_16_0_PATCHES

Details
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http://git.postgresql.org/gitweb?p=pgadmin3.git;a=commitdiff;h=3493e5d43fb97d59e9ee49250af69c4986df685c

Modified Files
--------------
pgadmin/db/pgConn.cpp           |    8 +++++++-
pgadmin/dlg/dlgSearchObject.cpp |    2 +-
pgadmin/include/db/pgConn.h     |    1 +
3 files changed, 9 insertions(+), 2 deletions(-)