Use MEDIA_SERIAL for images in datagrids.

Review Request #1887 — Created Nov. 1, 2010 and submitted — Latest diff uploaded

This change includes the MEDIA_SERIAL cache-buster on some static image references in the datagrid, which prevents the same image from being served with different URLs in different parts of the application and thus triggering extra GETs in the browser.

This is change in GitHub.
In use internally for a while - verified that it prevents a couple image downloads and makes Google Page Speed happy.