Fixes side navigation and media manager in Internet Explorer 11.

Back-end navigation item order has been updated (increased by multiple of 10). Some plugins may need to adjust their navigation order values. The repeater form widget now supports a maxItems option.

Fixes bug when creating a related file attachment from a local file path.

The public path returned from getPath() is no longer relative, it is now returned as a fully qualified URL.

Minor change in AJAX framework for supporting Cross-Origin Resource Sharing (CORS) requests.

Improvements to database internals: duplicate queries derived from models are now cached in memory, this can be disabled with the $duplicateCache model property.

Introduce CMS theme logging enabled via Log settings. Request logging is now disabled by default.

Improvements to the client-side framework: support overriding logic with handle functions and introduce ajaxSetup event for modifying options (see AJAX > JavaScript API docs).

The Nullable trait no longer incorrectly treats zero and false as null.

Repeater form widget now includes a collapse / expand button.

Fixes import functionality when using CDN storage.

OpCache can now be busted using the cms.forceBytecodeInvalidation configuration item.