adjusted M::Audit::_lab_test_data() to return timestamps instead of dates for lab_test_audit.pl script - does not affect lab test turnaround times resource

activated lab_test_audit.pl in test mode

bugfix to previous change to xna_extraction_type query param - xna_extraction type now handled as lc within app, transformed to uc only in tt for view

new setting 'is_test_platform' to exempt test server from portal login requirement; new outreach worklists unreported and unauthorised; added user-configurable duration option on unreported worklist, shared with outreach unreported; adapted Resources token generation function to provide encrypted username for online request forms; bugfix to _xna_extraction() - lc on query param extraction_type gave error if param undef

new lab-test audit script; moved common M::Audit::turnaround_times_lab_tests() functions into M::Audit::_lab_test_data() for share with new lab_test_turnaround_export() function; lab test turnaround times sets correct start time of tests auto-requested at registration (eg histology stains), previously assumed to be at screening; M::Roles::Query::_set_search_constraints() accepts DateTime objects for date_from & date_to params