fixed failure to load images when report rendered as PDF - required CGISESSID param passing, either in url or cookie, HTML::HTMLDOC doesn't support cookie param (though HTMLDOC binary does), so set CGISESSID as url 'get' param}
git-svn-id: https://jti.org.uk/svn/hmds_lims/trunk@1001 4177bd82-f056-0410-812d-caef170e3fa0
