1.38 [KK 2007-04-26] Many changes:
     - 'crossroads status' now supports optional service/backend arguments.
     - Added specific nullstring initializers to parser.y.
     - Added info on ip_conntrack_max to the tips section of the docs
       (Thanks, Felix).
     - Rewritten the code that timeouts upon network connect (this used
       to have jumps which isn't safe). 
     - Added docs on -t (tabular status report) flag.
     - Added code to avoid logging and running on-end hooks when HTTP
       mode fails to find a suitable back end.
     - Added test/t8.conf which works with breaking-client, to
       simulate clients that hang up.
     - 'make clean' removes GDB's history files
     - Removed usage of non-reentrant functions from signal handler
       (interrupt.c) 
     - Added RETRY_WAIT, small sleep time when retrying connecting to
       the same back end
     - Added description of retries keyword to the Tips&Tricks section
     - Fixed mark_activity() to apply decays only for 'true'
       connections, not for wakeup calls
     - Split up the tips section of the docs into separate sources.
     - Added flag -C to show compile-time settings.
     - Sped up make process by scanning c-conf output just once (:=
       instead of =, probably GNU Make only, we'll see).