pgAdmin 4 commit: Add support for casts.

Add support for casts.

Branch
------
master

Details
-------
http://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=f466e0169a9544f8b2354b4dd13031b91c99d381
Author: Sanket Mehta <sanket(dot)mehta(at)enterprisedb(dot)com>

Modified Files
--------------
.../servers/databases/casts/__init__.py | 643 +++++++++++++++++++++
.../servers/databases/casts/static/img/cast.png | Bin 0 -> 426 bytes
.../databases/casts/static/img/coll-cast.png | Bin 0 -> 402 bytes
.../databases/casts/templates/cast/js/casts.js | 302 ++++++++++
.../casts/templates/cast/sql/9.1_plus/create.sql | 20 +
.../casts/templates/cast/sql/9.1_plus/delete.sql | 14 +
.../templates/cast/sql/9.1_plus/functions.sql | 17 +
.../cast/sql/9.1_plus/getsrcandtrgttype.sql | 46 ++
.../templates/cast/sql/9.1_plus/properties.sql | 61 ++
.../casts/templates/cast/sql/9.1_plus/sql.sql | 44 ++
.../casts/templates/cast/sql/9.1_plus/update.sql | 6 +
11 files changed, 1153 insertions(+)