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Merge r1407459, r1407460, r1419781, r1418524, r1401448, r1405407, r1405973, r1419726, r1418769, r1417197 from trunk:

remove warning:
mod_remoteip.c:404:38: warning: data argument not used by format string [-Wformat-extra-args]
It's a hack, but maintain the orig hack ;)

Remove warnings
mod_speling.c:400:41: warning: data argument not used by format string [-Wformat-extra-args]
                          r->uri, nuri, ref);
                                                                                                                        mod_speling.c:508:53: warning: data argument not used by format string [-Wformat-extra-args]
                          r->uri, candidates->nelts, ref);

Use 'apr_is_empty_table()' instead of testing against 'apr_table_elts(...)->nelts'

Use ap_rputs instead of ap_rvputs where applicable.

No need to apr_pstrdup things here, 'apr_socket_accept_filter' already makes it own copy.

Not compiled nor tested as on my system APR_HAS_SO_ACCEPTFILTER is set to 0.

revert r1401448 and add a comment on why there's a bewildering copy
of args passed to apr_socket_accept_filter()


cppCheck: kill two warnings about incorrect printf parameters.
'worker_thread_count' is unsigned

cppCheck: same expression on both side of '|'.
Fix it the same way other messages are managed in the function.

Fix a few 'too many arguments for format' warnings


cppCheck: kill a unread variable warning
Submitted by: jim, jailletc36, jailletc36, jailletc36, trawick, jailletc36, jailletc36, sf, jailletc36
Reviewed/backported by: jim


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to dbmmanage note.

Backport of r1420149 from trunk.


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Bring XML output up to snuff for balancer-manager

and allow the xml param
Reviewed/backported by: jim


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Submitted by: fuankg
Backported by: rjung
Reviewed by: fuankg,rjung (CTR docs/comment)

Backport of r1391771 from trunk.


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- Move many common code parts into separate source file. This adds some
  of htpasswd's recent improvements to htdbm.
- Rework salt generation to use the full 48bit of entropy for MD5
  Previously, it would only generate 2^32 different salts on a given
  platform.
- Use apr_getopt().
Submitted by: sf
Backport of r1395253 from trunk.

Add passwd_common.c build support for Windows and Netware
Submitted by: sf
Backport of r1395254 from trunk.

Add support for bcrypt (requires apr-util 1.5 or higher).
PR: 49288
Submitted by: sf
Backport of r1395255 from trunk.

Optionally read passwords from stdin as more secure alternative to -b.
PR: 40243
Submitted by: Adomas Paltanavicius <adomas paltanavicius gmail com>, sf
Backport of r1395256 from trunk.
Submitted by: Adomas Paltanavicius <adomas paltanavicius gmail com>, sf

Removed __func__ usage which is c99.
Submitted by: sf
Backport of r1395792 from trunk.

All of the above backported by: sf
All of the above reviewed by: sf, gsmith, rjung

fix unresolved external symbol __imp__UuidCreate error
Submitted by: gsmith
Backported by: gsmith
Reviewed by: gsmith, rjung
Backport of r1419084 from trunk.


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fail to load without providing an error message of their own.

Submitted by: minfrin
Backported by: minfrin
Reviewed by: minfrin, sf, rjung

Backport of r1418655 from turnk.


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AuthFormLoginRequiredLocation, AuthFormLoginSuccessLocation
and AuthFormLogoutLocation directives.

mod_auth_form: Make sure 500 Internal Server Error is
returned should an error occur while parsing an expression.

Submitted by: minfrin
Backported by: minfrin
Reviewed by: minfrin, sf, rjung

Backports of r1388648 and r1418721 from trunk.


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for TLS, RFC 5054).
Including some improvements as suggested by Kaspar

PR: 51075
Submitted by: Quinn Slack <sqs cs stanford edu>, Christophe Renou,
              Peter Sylvester
Backported by: sf
Reviewed by: sf, minfrin, rjung

Backports of r1347980 and r1348653 form trunk.


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   * mod_rewrite: PR53963: Ad an opt-in RewriteOption to control merging of RewriteBase
                  (This merge started happening in 2.4.0/2.2.23)

Submitted by: covener
Reviewed by: covener, minfrin, sf



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    1398970: Use 'ap_strcasestr' instead of a strdup/str_tolower/strstr sequence
    1407853: cppCheck:  Suspicious condition.
    1398480: cppcheck: arrayIndexThenCheck - change the order of the tests in
             order to avoid a potential out-of-bound access.
    1398478: ccpcheck: duplicateExpression - 'vary_by_language' is tested twice
    1411862: Use apr_is_empty_table() instead of getting a table and checking the
             value of the 'nelts' field.
    1397320: remove extra ';'

Submitted by: jailletc36
Reviewed by: jailletc36, minfrin, sf


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various mods: host and URI escaping:

    Be sure to escape potential troubled strings

    add missing html escaping

Submitted by: jim, sf
Reviewed by: covener, minfrin, sf



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    Allow for exposure of loadavg and server load via mod_headers

    Might as well show 'em all

    Document new mod_headers params: %l, %i, %b

Submitted by: jim
Reviewed by: jailletc36, druggeri, minfrin


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    make varbuf functions treat AP_VARBUF_UNKNOWN consistently, improve docs

    ap_varbuf_pdup(): copying the whole buffer in case strlen ==
    AP_VARBUF_UNKNOWN does not make sense as the caller can not set
    the exact buffer size, only a minimum. No API change as previously
    the behavior with AP_VARBUF_UNKNOWN was undocumented.

    regsub_core(): Checking for vb->buf is useless, it cannot be NULL
    unless ap_varbuf_init has not been called.

    ap_varbuf_cfg_getline(): Initially, allocate enough memory to hold
    an empty line. If strlen == AP_VARBUF_UNKNOWN, use strlen(buf) instead
    of undefined behavior.

Reviewed by: jim, sf, minfrin



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    Make ap_regcomp() return AP_REG_ESPACE if out of memory.  Make ap_pregcomp()
    abort if out of memory.
    
    This raises the minimum PCRE requirement to version 6.0, released in 2005.

Reviewed by: jim, sf, minfrin



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