bugfixes - new_request validation was broken by having 2 msg keys; fixed issue_diagnosis_revision_alert() in previous version caused test scripts to trigger messaging
patched C::Screen::edit() to use same screening function as used at initial screen; fixed a lot of failing tests due to new screening functions - report_status.t still failing
moved request audit in screening function to optional & disabled it; moved set_querylog_args & set_errorhandler_args near top of cgiapp_prerun() so they take effect for login & session update handling
