Changes since R201802

In addition to numerous bug fixes, tweaks, refinements, and optimizations, the major changes since R201802 are:

Support Ubuntu 16.04 middleware, including PHP 7.0
Support jpgraph version 4.2.0
Move manager and sitemanager columns to usersettings
$writeBIGtable support, including project_pages table, has been removed
Proofreading and Formatting Guidelines translations have been moved to language-specific subdirectories under faq/
Large file uploads in remote_file_manager.php
View page differences without formatting
Cleanup of users table
Task Center updates
RSS feed improvements
Smooth Reading transition updates and notifications
DPCustomMono2 available as a web font
Gravatar support
User registrations ask about how they found the site
Server time now displayed on PM page
My Project links no longer reuse windows

Middleware version support

This is the last release to support PHP 5.3. Future releases will require PHP 7.0 or later.