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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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rpm: Remove stray references to the epoch variable.


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Translated by: Nilgün Belma Bugüner <nilgun belgeler.org>
Reviewed by:  Orhan Berent <berent belgeler.org>

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Allow for setting of sticky session split char...
Bugz 53893

Reviewed/backported by: jim


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mod_dumpio: Correctly log large messages + style issues
PR 54179 

Submitted by: Marek Wianecki
Reviewed by: jailletc36, sf, druggeri




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PR54223: 2.4 generates AH00554 when Include points to a directory with no wildcard.

r931435 refactored ap_process_resource_config() so it didn't read through 
directories, but also changed a path non-fnmatch directories are passed 
through to call ap_process_resource_config().




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PR54222: catch invalid ServerTokens args

Submitted by: Jackie Zhang  <jackie.qq.zhang gmail.com>
Reviewed/modified by: covener



Sort error message for ServerTokens by increasing verbosity. Add missing 'OS'
variant.

Remove some trailing whitespace.



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