set-up environment variables yet.
Moved 301 and 302 error strings to shared string constants.
http_logoff() now logs the correct socket descriptor (instead of -1) when
called from http_session_thread().
is_dynamic_req() now correctly checks both the directory *and* drive of the
configured cgi_dir against the requested physical path (required for Win32).
Sets sane startup->max_cgi_inactivity value (2 minutes) if uninitialized.