pgAdmin 4 commit: Load, and save the files in the Query Editor.

Load, and save the files in the Query Editor.

Also, the changes done by Ashesh to resolved few issue with the file
manager in 'Select' mode.

Branch
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master

Details
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http://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=1aeab98a2bc50eb0f735b1aced8d83a83675a58e
Author: Surinder Kumar <surinder.kumar@enterprisedb.com>

Modified Files
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.../templates/file_manager/js/utility.js           | 1386 +++++++++++---------
web/pgadmin/static/css/overrides.css               |    9 +
.../tools/datagrid/templates/datagrid/index.html   |    3 +
web/pgadmin/tools/sqleditor/__init__.py            |   93 +-
.../sqleditor/templates/sqleditor/js/sqleditor.js  |  133 +-
5 files changed, 995 insertions(+), 629 deletions(-)