pgAdmin III commit: Fix index columns, and definitions

Fix index columns, and definitions

Multiple fixes:
* show column names in constraints
* show complete columns names in indexes (were truncated with the last character)
* disable the columns list when modifying an existing index
* show the good informations in the righ columns

Per an initial report from Colin Beckingham.

Branch
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REL-1_14_0_PATCHES

Details
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http://git.postgresql.org/gitweb?p=pgadmin3.git;a=commitdiff;h=30c68ec0a5345c15a8a15c068f61177857aa0f25

Modified Files
--------------
CHANGELOG                          |    1 +
pgadmin/dlg/dlgIndex.cpp           |   84 ++++++++++++-----------------------
pgadmin/dlg/dlgIndexConstraint.cpp |    5 +-
pgadmin/include/schema/pgIndex.h   |   17 +++++++-
pgadmin/schema/pgIndex.cpp         |   30 +++++++++++++
5 files changed, 78 insertions(+), 59 deletions(-)