Normalise usernames to lowercase so that they are case insensitive. This is to prevent an issue with a certain "unnamed LDAP service" doing case insensative lookups meaning we will create duplicate users. Fixes lp:415171
<py:for each="segment in paths">/<a href="${segment['href_path']}" title="Navigate to ${segment['nav_path']}">${segment['path']}</a></py:for> (Subversion diff)