added function to notify admin of system error generated by LIMS::error(); C::Roles::RecordHandler::get_previous_cases() skips non-matching nhs_numbers if current request has an nhs_number}
git-svn-id: https://jti.org.uk/svn/hmds_lims/trunk@1305 4177bd82-f056-0410-812d-caef170e3fa0