2.53 [KK 2009-04-24]
- test/xr-client-ping now can live without LWP::UserAgent. When this
  Perl module is not present, the script will fall back to wget/curl.
- Upon thread kill, sockets are closed using socketclose()
  (sys/socketclose.cc), which also shutdown()s the socket.
- Bugfix in xrctl regarding new format of client/backend timeout.