scoreboard/status: Keep previous worker connection/request data when idle as
prior to 2.4.20.


scoreboard/status: follow up to r1739008.
Restore (completely) pre-2.4.20 behaviour w.r.t. preserved values.
r1739008 was still unnessessarily blanking some values for the time of
BUSY_READ -> BUSY_WRITE (with blocking MPMs).


scoreboard/status: follow up to 1739146.
Comment not needed anymore...


Clarify CHANGES entry, including the correct version for the
restored behaviour.

Submitted by: ylavic
Reviewed/backported by: jim


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  Replace nonsense statement in the backport proposal (the backport has
  merit, but for an altogether different reason).

  http2-wg has no impact on HTTP/1.1 protocol, and Upgrade: request and
  response in this case is defined by the HTTP/1.1 RFC, alone.  An Upgrade
  header in an HTTP/2.0 stream is entirely under the scope of HTTP/2.0 RFC.



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Fix link to distcache. 
http://www.distcache.org/ --> http://distcache.sourceforge.net/

(r1740717 in trunk)

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mod_http2: disabling mmap on file buckets, changing r->protocol to HTTP/2.0


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(r1739045 in trunk)

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Synch with trunk (r1468709 and r1481364)

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Align examples on the left to be consistent
Add some missing <em> in syntax description
Add some hyperlinks to modules and directives
Fix some bogus <directive type="section"> usage
Fix typo
(r1738690 and r1738693 in trunk)

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