* released 1.1.18

* released 1.1.18
* Haproxy can be compiled with PCRE regex instead of libc regex, by setting
  REGEX=pcre on the make command line.
* HTTP health-checks now use "OPTIONS *" instead of "OPTIONS /".
* when explicit source address binding is required, it is now also used for
  health-checks.
* added 'reqpass' and 'reqipass' to allow certain headers but not the request
  itself.
* factored several strings to reduce binary size by about 2 kB.
* replaced setreuid() and setregid() with more standard setuid() and setgid().
* added 4 status flags to the log line indicating who ended the connection
  first, the sessions state, the validity of the cookie, and action taken on
  the set-cookie header.
* rearranged the changelog and removed it from haproxy.c
* large documentation updates