This engine supports legacy bin scripts that don't use
$Foswiki::cfg{SwitchBoard} yet.
It redefines Foswiki::Request::new and Foswiki::Response::new, so request and
response objects are singletons, making it possible to the engine finalization
phase invoked from the END block happens.
Could not perform search. Error was: Error in tempfile() using /tmp/STDERR.14496.XXXXXXXXXX: Could not create temp file /tmp/STDERR.14496.__522Wwrpj: Read-only file system