pgAdmin 4 commit: Misc fixes and additions for pgAgent support:

Misc fixes and additions for pgAgent support:

- Added DatetimepickerControl, MomentCell (using moment.js)
- Used the 'DatetimepickerControl' in Role (Also - resolved an issue, when unset the datetime for 'Valid Until'.)
- Added a 'Select All/Unselect All' adaptor for Select2 used by pgAgent nodes.
- Fixed an issue with SubNodeCollectionControl, which was not starting the modification session of the child model, when created default value for collection is not null/undefined. And, hence - validation on the child model was not working.
- Fixed a memory leak with SqlFieldControl, and SqlTabControl, which was not releasing the CodeMirror properly.

Branch
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master

Details
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http://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=163ae4d53d65940061b55c6a9fa80424e899813b
Author: Ashesh Vashi <ashesh(dot)vashi(at)enterprisedb(dot)com>

Modified Files
--------------
.../server_groups/servers/roles/__init__.py | 13 +-
.../servers/roles/templates/role/js/role.js | 28 +-
.../roles/templates/role/sql/post8_4/update.sql | 5 +-
.../roles/templates/role/sql/post9_0/update.sql | 4 +-
.../roles/templates/role/sql/post9_1/update.sql | 4 +-
.../roles/templates/role/sql/post9_4/update.sql | 4 +-
web/pgadmin/browser/static/js/node.ui.js | 76 +-
.../browser/templates/browser/js/messages.js | 4 +-
.../templates/preferences/preferences.js | 5 +-
.../static/css/bootstrap-datetimepicker.min.css | 5 +
web/pgadmin/static/css/overrides.css | 47 +-
web/pgadmin/static/css/pgadmin.css | 4 +
web/pgadmin/static/js/backform.pgadmin.js | 196 +-
web/pgadmin/static/js/backgrid/backgrid.pgadmin.js | 202 +-
web/pgadmin/static/js/bootstrap-datetimepicker.js | 2623 ++++
.../static/js/bootstrap-datetimepicker.min.js | 217 +
web/pgadmin/static/js/moment-with-locales.js | 12251 +++++++++++++++++++
web/pgadmin/static/js/moment-with-locales.min.js | 678 +
web/pgadmin/templates/base.html | 13 +-
19 files changed, 16304 insertions(+), 75 deletions(-)