r1643672, r1496178 from trunk

   * Synch with trunk:
        - Add missing APLOGNO.
        - mod_deflate: don't require <limits.h> by using APR_INT32_MAX instead of INT_MAX.
        - Move two variable assignments off the fast path.
        - Fix curly braces style. Remove useless empty lines
        - tab vs space
        - Removed tabs.
        - dump fcgi headers with trace8 instead of debug+compile-time flag.
        - Drop severity of "LDAP: Setting referrals to ON" from DEBUG to TRACE4

Submitted by: jailletc36, ylavic, minfrin, fuankg, covener
Reviewed by: jailletc36, minfrin, ylavic
Backported by: jailletc36

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as in r1517366, drop the severity in authz_groupfile when a require
didn't match but no real error was encountered. 

This individual 'require group' may not really dictate who gets in. PR55523 




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Mention notable things added in 2.4.x

Mention mod_macro, mod_wstunnel, mod_authnz_fcgi and a few other notable
features that were added post 2.4.0



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   * mod_authn_dbd: Precedence issue. Fix the error message logged in case of
     error while querying the database.

Submitted by: jailletc36
Reviewed by: jailletc36, mrumph, minfrin
Backported by: jailletc36

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   * mod_proxy_connect: fix duplicated AH introduced by r1635645
      (and merged to 2.4.11 in r1642857)

Submitted by: ylavic
Reviewed by: ylavic, jailletc36, minfrin
Backported by: jailletc36

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+ be consistent with the position of '*'

backport r1659848

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Fix typo already fixed in trunk (missing part of r1648557 ; the other fixes have been done in r1648559)

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PR57094: Provide some hints about Windows problems 
with more than a few dozen piped loggers.

Submitted by: Edward Lu



add a generic tuning section and linked to the piped logger
issue in logs.html



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