Enhancements:
- New tab in diagnostic page showing the leave requests without entitlements.
- Add an alert message into Leave Balance report if at least one leave request has no entitlements.
- Technical update of PHPMailer (CVE-2016-10033, CVE-2016-10045, CVE-2017-5223)
Bugs fixed:
- Undefined variable when creating a leave request in behalf of a subordinate.
- Leave cancellation doesn't add an entry in LR history.
- Remove false Ajax error triggered into organization.
- Style: Remove vertical scrollbar.