Merge r1611979, r1611725, r1588448, r1642803, r1657949, r1451108 (part of it),

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

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1661845 13f79535-47bb-0310-9956-ffa450edef68