added _centre to %settings in lims_config.pl as $ENV{CENTRE} not available to app so Admin::Config::Settings::_get_settings could not load correct file for Oxford, Cambridge, etc; added base_href setting for wkhtmltopdf use in templates}
git-svn-id: https://jti.org.uk/svn/hmds_lims/trunk@1797 4177bd82-f056-0410-812d-caef170e3fa0