Security update to version 1.4.23.

ChangeLog:
2013/04/03 : 1.4.23
 - CONTRIB: halog: sort URLs by avg bytes_read or total bytes_read
 - BUG: fix garbage data when http-send-name-header replaces an existing header
 - BUG/MEDIUM: remove supplementary groups when changing gid
 - BUG/MINOR: Correct logic in cut_crlf()
 - BUG/MINOR: config: use a copy of the file name in proxy configurations
 - BUG/MINOR: epoll: correctly disable FD polling in fd_rem()
 - MINOR: halog: sort output by cookie code
 - BUG/MINOR: halog: -ad/-ac report the correct number of output lines
 - BUG/MINOR: halog: fix help message for -ut/-uto
 - BUG/MEDIUM: http: set DONTWAIT on data when switching to tunnel mode
 - BUG/MEDIUM: command-line option -D must have precedence over "debug"
 - OPTIM: halog: keep a fast path for the lines-count only
 - MINOR: halog: add a parameter to limit output line count
 - BUG: halog: fix broken output limitation
 - MEDIUM: checks: avoid accumulating TIME_WAITs during checks
 - MEDIUM: checks: prevent TIME_WAITs from appearing also on timeouts
 - BUG/MAJOR: cli: show sess <id> may randomly corrupt the back-ref list
 - BUG/MINOR: http: don't report client aborts as server errors
 - BUG/MINOR: http: don't log a 503 on client errors while waiting for requests
 - BUG/MEDIUM: tcp: process could theorically crash on lack of source ports
 - BUG/MINOR: http: don't abort client connection on premature responses
 - BUILD: no need to clean up when making git-tar
 - MINOR: http: always report PR-- flags for redirect rules
 - BUG/MINOR: time: frequency counters are not totally accurate
 - BUG/MINOR: http: don't process abortonclose when request was sent
 - BUG/MINOR: epoll: use a fix maxevents argument in epoll_wait()
 - BUG/MINOR: config: fix improper check for failed memory alloc in ACL parser
 - BUG/MEDIUM: checks: ensure the health_status is always within bounds
 - CLEANUP: http: remove a useless null check
 - BUG/MEDIUM: signal: signal handler does not properly check for signal bounds
 - BUG/MEDIUM: uri_auth: missing NULL check and memory leak on memory shortage
 - CLEANUP: config: slowstart is never negative
 - BUILD: improve the makefile's support for libpcre
 - BUG/MINOR: checks: fix an warning introduced by commit 2f61455a
 - MEDIUM: halog: add support for counting per source address (-ic)
 - DOC: mention the new HTTP 307 and 308 redirect statues     (cherry picked from commit b67fdc4cd8bde202f2805d98683ddab929469a05)
 - MEDIUM: poll: do not use FD_* macros anymore
 - BUG/MAJOR: ev_select: disable the select() poller if maxsock > FD_SETSIZE
 - BUILD: enable poll() by default in the makefile
 - BUILD: add explicit support for Mac OS/X
 - BUG/CRITICAL: using HTTP information in tcp-request content may crash the process
 - MEDIUM: http: implement redirect 307 and 308
 - MINOR: http: status 301 should not be marked non-cacheable
Security update to version 1.4.24.

ChangeLog:

- BUG/MAJOR: backend: consistent hash can loop forever in certain circumstances
- BUG/MEDIUM: checks: disable TCP quickack when pure TCP checks are used
- MEDIUM: protocol: implement a "drain" function in protocol layers
- BUG/CRITICAL: fix a possible crash when using negative header occurrences
Fix segfault when no server available (DATASET-871).