Adds content to the header of the admin theme.

This hook is fired by the header.php script, which is loaded by a call to head() while it is populating the <head> tag for the admin theme.

Functions attaching to this hook can directly output HTML into the <head>, or use functions like queue_css and queue_js.

Plugins will likely not need to add content to the admin-side <head> for every page, but the passed request object can be used to include content on particular pages only.


Omeka_View view
The view object