core: Optimize string concatenation in expression
parser when evaluating a string expression.

We have a relatively small recursion limit of
about 10 operations. This is a compilation
limit (a define). It can be hit if many expr
vars or function calls are concatenated in an
expression that is evaluated as a string not as
a boolean.

The new optimization uses iteration instead of
recursion and is very similar to the
existing one, which optimizes consecutive
concatenations in node2 of the tree. The new
one optimizes consecutive concatenations in
node 1.

Submitted by: rjung
Reviewed by: rjung, ylavic, covener
Backported by: rjung


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Anyone who votes is free to move them back up.



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improve some slightly awkward wording per comments feedback:

  http://httpd.apache.org/docs/2.4/configuring.html#comment_3678

The original can be read as applying to comments on a subsequent line.



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   * acinclude.m4: Generate #LoadModule directive in default httpd.conf for
                   every --enable-mpms-shared. PR 53882.

Submitted by: olli hauer <ohauer gmx.de>, Yann Ylavic
Reviewed by: ylavic, rjung, jailletc36
Backported by: jailletc36

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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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