Wrong initialization if eZSys subsystem:

Is:
eZSys::init( 'webdav.php' );

Should be:
eZSys::init( 'webdav.php', $ini->variable( 'SiteAccessSettings', 'ForceVirtualHost' ) == 'true' );

like in index.php.

Steps to reproduce

Fresh install in such a setup that requires the ForceVirtualHost setting set to true (ie Lighttpd with fastcgi or fastcgi in general). Try to access the webdav - the eZSys gets wrongly initialized and consequently sets wrong requestURI (empty) rendering the webdav unusable.