Update to 2.4.7

Changelog:
Changes with Apache 2.4.7

  *) APR 1.5.0 or later is now required for the event MPM.

  *) slotmem_shm: Error detection. [Jim Jagielski]

  *) event: Use skiplist data structure. [Jim Jagielski]

  *) mpm_unix: Add ap_mpm_podx_* implementation to avoid code duplication
    and align w/ trunk. [Jim Jagielski]

  *) Fix potential rejection of valid MaxMemFree and ThreadStackSize
    directives.  [Mike Rumph <mike.rumph oracle.com>]

  *) mod_proxy_fcgi: Remove 64K limit on encoded length of all envvars.
    An individual envvar with an encoded length of more than 16K will be
    omitted.  [Jeff Trawick]

  *) mod_proxy_fcgi: Handle reading protocol data that is split between
    packets.  [Jeff Trawick]

  *) mod_ssl: Improve handling of ephemeral DH and ECDH keys by
    allowing custom parameters to be configured via SSLCertificateFile,
    and by adding standardized DH parameters for 1024/2048/3072/4096 bits.
    Unless custom parameters are configured, the standardized parameters
    are applied based on the certificate's RSA/DSA key size. [Kaspar Brand]

  *) mod_ssl, configure: Require OpenSSL 0.9.8a or later. [Kaspar Brand]

  *) mod_ssl: drop support for export-grade ciphers with ephemeral RSA
    keys, and unconditionally disable aNULL, eNULL and EXP ciphers
    (not overridable via SSLCipherSuite). [Kaspar Brand]

  *) Add experimental cmake-based build system for Windows.  [Jeff Trawick,
    Tom Donovan]

  *) event MPM: Fix possible crashes (third party modules accessing c->sbh)
    or occasional missed mod_status updates for some keepalive requests
    under load. [Eric Covener]

  *) mod_authn_socache: Support optional initialization arguments for
    socache providers.  [Chris Darroch]

  *) mod_session: Reset the max-age on session save. Bug 47476. [Alexey
    Varlamov <alexey.v.varlamov gmail com>]

  *) mod_session: After parsing the value of the header specified by the
    SessionHeader directive, remove the value from the response. Bug 55279.
    [Graham Leggett]

  *) mod_headers: Allow for format specifiers in the substitution string
    when using Header edit. [Daniel Ruggeri]

  *) mod_dav: dav_resource->uri is treated as unencoded. This was an
    unnecessary ABI changed introduced in 2.4.6. Bug 55397.

  *) mod_dav: Don't require lock tokens for COPY source. Bug 55306.

  *) core: Don't truncate output when sending is interrupted by a signal,
    such as from an exiting CGI process. Bug 55643. [Jeff Trawick]

  *) WinNT MPM: Exit the child if the parent process crashes or is terminated.
    [Oracle Corporation]

  *) Windows: Correct failure to discard stderr in some error log
    configurations.  (Error message AH00093)  [Jeff Trawick]

  *) mod_session_crypto: Allow using exec: calls to obtain session
    encryption key.  [Daniel Ruggeri]

  *) core: Add missing Reason-Phrase in HTTP response headers.
    Bug 54946. [Rainer Jung]

  *) mod_rewrite: Make rewrite websocket-aware to allow proxying.
    Bug 55598. [Chris Harris <chris.harris kitware com>]

  *) mod_ldap: When looking up sub-groups, use an implicit objectClass=*
    instead of an explicit cn=* filter. [David Hawes <dhawes vt.edu>]

  *) ab: Add wait time, fix processing time, and output write errors only if
    they occured. [Christophe Jaillet]

  *) worker MPM: Don't forcibly kill worker threads if the child process is
    exiting gracefully.  [Oracle Corporation]

  *) core: apachectl -S prints wildcard name-based virtual hosts twice.
    Bug 54948 [Eric Covener]

  *) mod_auth_basic: Add AuthBasicUseDigestAlgorithm directive to
    allow migration of passwords from digest to basic authentication.
    [Chris Darroch]

  *) ab: Add a new -l parameter in order not to check the length of the responses.
    This can be usefull with dynamic pages.
    Bug 9945, Bug 27888, Bug 42040 [<ccikrs1 cranbrook edu>]

  *) Suppress formatting of startup messages written to the console when
    ErrorLogFormat is used.  [Jeff Trawick]

  *) mod_auth_digest: Be more specific when the realm mismatches because the
    realm has not been specified. [Graham Leggett]

  *) mod_proxy: Add a note in the balancer manager stating whether changes
    will or will not be persisted and whether settings are inherited.
    [Daniel Ruggeri, Jim Jagielski]

  *) mod_cache: Avoid a crash with strcmp() when the hostname is not provided.
    [Graham Leggett]

  *) core: Add util_fcgi.h and associated definitions and support
    routines for FastCGI, based largely on mod_proxy_fcgi.
    [Jeff Trawick]

  *) mod_headers: Add 'Header note header-name note-name' for copying a response
    headers value into a note. [Eric Covener]

  *) mod_headers: Add 'setifempty' command to Header and RequestHeader.
    [Eric Covener]

  *) mod_logio: new format-specifier %S (sum) which is the sum of received
    and sent byte counts.
    Bug 54015 [Christophe Jaillet]

  *) mod_deflate: Improve error detection when decompressing request bodies
    with trailing garbage: handle case where trailing bytes are in
    the same bucket. [Rainer Jung]

  *) mod_authz_groupfile, mod_authz_user: Reduce severity of AH01671 and AH01663
    from ERROR to DEBUG, since these modules do not know what mod_authz_core
    is doing with their AUTHZ_DENIED return value. [Eric Covener]

  *) mod_ldap: add TRACE5 for LDAP retries. [Eric Covener]

  *) mod_ldap: retry on an LDAP timeout during authn. [Eric Covener]

  *) mod_ldap: Change "LDAPReferrals off" to actually set the underlying LDAP
    SDK option to OFF, and introduce "LDAPReferrals default" to take the SDK
    default, sans rebind authentication callback.
    [Jan Kaluza <kaluze AT redhat.com>]

  *) core: Log a message at TRACE1 when the client aborts a connection.
    [Eric Covener]

  *) WinNT MPM: Don't crash during child process initialization if the
    Listen protocol is unrecognized.  [Jeff Trawick]

  *) modules: Fix some compiler warnings. [Guenter Knauf]

  *) Sync 2.4 and trunk
      - Avoid some memory allocation and work when TRACE1 is not activated
      - fix typo in include guard
      - indent
      - No need to lower the string before removing the path, it is just a waste of time...
      - Save a few cycles
    [Christophe Jaillet <christophe.jaillet wanadoo.fr>]

  *) mod_filter: Add "change=no" as a proto-flag to FilterProtocol
    to remove a providers initial flags set at registration time.
    [Eric Covener]

  *) core, mod_ssl: Enable the ability for a module to reverse the sense of
    a poll event from a read to a write or vice versa. This is a step on
    the way to allow mod_ssl taking full advantage of the event MPM.
    [Graham Leggett]

  *) Makefile.win: Install proper pcre DLL file during debug build install.
    Bug 55235.  [Ben Reser <ben reser org>]

  *) mod_ldap: Fix a potential memory leak or corruption.  Bug 54936.
    [Zhenbo Xu <zhenbo1987 gmail com>]

  *) ab: Fix potential buffer overflows when processing the T and X
    command-line options.  Bug 55360.
    [Mike Rumph <mike.rumph oracle.com>]

  *) fcgistarter: Specify SO_REUSEADDR to allow starting a server
    with old connections in TIME_WAIT.  [Jeff Trawick]

  *) core: Add open_htaccess hook which, in conjunction with dirwalk_stat
    and post_perdir_config (introduced in 2.4.5), allows mpm-itk to be
    used without patches to httpd core. [Stefan Fritsch]

  *) support/htdbm: fix processing of -t command line switch. Regression
    introduced in 2.4.4
    Bug 55264 [Jo Rhett <jrhett netconsonance com>]

  [Apache 2.3.0-dev includes those bug fixes and changes with the
  Apache 2.2.xx tree as documented, and except as noted, below.]

Changes with Apache 2.2.x and later:

  *) http://svn.apache.org/viewvc/httpd/httpd/branches/2.2.x/CHANGES?view=markup

Changes with Apache 2.0.x and later:

  *) http://svn.apache.org/viewvc/httpd/httpd/branches/2.0.x/CHANGES?view=markup

(ryoon)