This is a Pre release and should not be used in a production environment.
Try 7.8.0 RC to preview the new features coming in SuiteCRM 7.8.
The focus of SuiteCRM 7.8 is to enhance and refine the SuiteP theme and fix many issues
SuiteP Rewritten in SASS, Refined List View filters, added support for PHP 7.1 and this release includes a great contribution of Workflow Calculated Fields from diligent technology & business consulting GmbH (http://www.dtbc.eu/)
Click here to get the full details of this release and to get the upgrade package